J. M. Baltazar, M. Rajchenberg: Hypoderma romeroae sp. nov.

116

Baltazar, Juliano M.

; Mario Rajchenberg

2,3

Programa de Pós-Graduação em Botânica, Departamento de Botânica, Universidade Federal do Rio Grande

do Sul, Av. Bento Gonçalves 9500, CEP 91501-970, Porto Alegre, RS, Brazil

Área de Protección Forestal, Centro de Investigación y Extensión Forestal Andino Patagónico, Ruta C.C.

14, 9200 Esquel, Chubut, Argentina

Corresponding author: mrajchenberg@ciefap.org.ar

Recibido: 28/02/14 – Aceptado: 22/04/14

Resumen — Baltazar, Juliano M.; Mario Rajchenberg. 2014. «Hyphoderma romeroae

sp. nov., un nombre válido para “Mutatoderma brunneocontextum” (Basidiomycota, Polypora-

les)». Lilloa 51 (1). Hyphoderma romeroae sp. nov. es propuesto para la especie “Mutato-

derma brunneocontextum” C.E. Gómez que fuera inválidamente publicada previamente.

Palabras clave: Corticiaceae s.l., hongos corticioides, nomenclatura, taxonomía.

Abstract — Baltazar, Juliano M.; Mario Rajchenberg. 2014. «Hyphoderma romeroae

sp. nov., a valid name for “Mutatoderma brunneocontextum” (Basidiomycota, Polyporales)».

Lilloa 51 (1). Hyphoderma romeroae sp. nov. is proposed for the species previously invalidly

named as “Mutatoderma brunneocontextum” C.E. Gómez.

Keywords: Corticiaceae s.l., corticioid fungi, nomenclature, taxonomy.

INTRODUCTION

“Mutatoderma” (Parmasto) C.E. Gómez

(Gómez and Loewenbaum, 1976) was pro-

posed to place at generic rank a group of

several species previously placed in Hypho-

derma sectio Mutatoderma Parmasto (1968).

This section was characterized by basidi-

omes with brownish, chestnut to violaceous

grayish hymenial surface, membranous con-

sistency, presence of lepto and lamprocystid-

ia (i.e., metuloid cystidia), thick-walled hy-

phae, large basidiospores and a Spiniger

Stalpers anamorphic phase in culture condi-

tions. Pitifully, when proposing the new

combination and rank (as ‘gen. et stat.

nov.’), Gómez (in Gómez and Loewenbaum,

1976) failed to cite the basionym for the

new generic combination, thus failing to

meet the requirements of ICN Art. 41.5 (Inter-

national Code of Nomenclature for algae,

fungi and plants; McNeill et al., 2012).

Therefore, neither “Mutatoderma” at genus

rank nor the newly proposed species “Muta-

toderma brunneocontextum” C.E. Gómez

plus three new “Mutatoderma” combinations

were validly published (Gómez and Loewen-

baum, 1976).

The aim of this article is to formally intro-

duce the species to which the name “M. brun-

neocontextum” C.E. Gómez was applied.

TAXONOMY

Hyphoderma romeroae

C.E. Gómez, Baltazar & Rajchenb., sp. nov.

MycoBank n° MB807723

Missaplied names:

“Mutatoderma brunneocontextum” C.E.

Gómez, Bol. Soc. Argent. Bot. 17 (3-4): 346.

1976, nom. inval. (proposed in an invalid

genus).

“Hyphoderma brunneocontextum” M.

Galán, Darwiniana 32 (1-4): 239. 1993,

nom. inval. (no Latin; no holotype).

For a description (in Latin and Spanish)

see Gómez and Loewenbaum (1976) under

“Mutatoderma brunneocontextum”.

Lilloa 51 (1): 116–118, 2014

116

Hyphoderma romeroae sp. nov., a valid name for

“Mutatoderma brunneocontextum” (Basidiomycota,

Polyporales)

NOTA

Lilloa 51 (1): 116–118, 2014

117

Holotype: Argentina, Buenos Aires, Punta

Lara, ad truncum Pouteria salicifolia, leg.

C.E. Gómez G-2587, March 1975 (BAFC

24060!).

Etymology: named after Andrea Irene

Romero (Argentina), in recognition to her

contribuitions to the fungal taxonomy in

South America.

For a morphological description of the

basidiome, cultures and mating type studies

see Gómez and Loewenbaum (1976) under

“Mutatoderma brunneocontextum”. The new

taxon is characterized by a brownish context

formed by thick-walled, brown, clamped

hyphae that are loosely arranged and easily

discernible in microscopic examination, and

by a bipolar mating system. It shares with

H. mutatum (Peck) Donk, H. populneum

(Peck) Donk, H. heterocystidium (Burt) Donk

and H. variolosum Boidin et al. the forma-

tion of large crystal masses in between the

hymenophore, basidiospores longer than 10

µm, presence of leptocystidia and metuloids,

but all those species lack the formation of a

brown, soft context (McKeen, 1952; Boidin

et al., 1991).

In their study of the ‘hyphodermoid’ gen-

era found in Buenos Aires Province, Argenti-

na, Galán et al. (1993) followed Jülich and

Stalpers (1980) in considering “Mutatoder-

ma” (Parmasto) C. E. Gómez a synonym of

Hyphoderma, and proposed the new combi-

nation “Hyphoderma brunneocontextum (C.

E. Gómez) M. Galán”, not realizing that the

cited “basionym” was invalid. Hjortstam and

Ryvarden (2001) accepted “Hyphoderma

brunneocontextum”, stating that: ‘Galán did

not mention nom. nov., but in our opinion it

can clearly be interpreted as a such’. Howev-

er, this name is neither a comb. nov. nor a

nom. nov., because the supposed “basionym/

replaced synonym” is invalid. The only other

potential interpretation, as a sp. nov., fails

because no Latin description or diagnosis

was presented or referred to and no holotype

was designated by Galán et al. (1993), mak-

ing “H. brunneocontextum” invalid.

Additionally to the type specimen, Popoff

(2000) recorded the species from NE Argen-

tina from Chaco, Corrientes and Formosa

provinces, and also from Paraguay. His

record from Misiones (Popoff, 2000) was lat-

er published as “H. aff. brunneocontextum”

(Popoff, 1997; specimen Popoff 1017) but it

was considered to be H. variolosum by Hjort-

stam and Ryvarden (2007), who studied a

portion of the specimen kept at O. Popoff

(1997) stated that the specimen was charac-

terized by a context with compacted myceli-

um (not loosely arranged and tomentous), a

whitish to cream hymenial surface and long-

er basidiospores than in H. romeroae.

We studied four specimens collected and

determined by Popoff (2000) as “H. brunneo-

contextum” (see ‘Additional studied material’

below). These specimens are conspicuous and

fertile but lack the distinct tomentous, brown

context present in the type of H. romeroae.

On the contrary, they present a compactly

arranged context with hyphae that are not

easily discernible. It is most similar to the Af-

rican H. variolosum, a species that differs by

a tetrapolar mating system (Boidin et al.,

1991). To our knowledge, Popoff’s specimens

are identical to Lloydella cinereoalba Rick

(1940), a taxon that corresponds to a good

morphological species in Hyphoderma and is

being treated in a different manuscript on Jo-

hannes Rick type specimens of corticioid spe-

cies from southern Brazil.

In conclusion, H. romeroae is so far

known from the original type material,

which was collected in the gallery forest of

Río de La Plata at Punta Lara (Gómez and

Loewenbaum, 1976). It was not included in

the phylogenetic analyses of Hyphoderma by

Larsson (2007), but the morphologically

similar H. heterocystidium, H. mutatum,

and H. populneum were included by this au-

thor in his tentative circumscription of the

genus. Phylogenetic results by him and Tell-

ería et al. (2012) show that a further subdi-

vision of Hyphoderma may become neces-

sary, but this is far beyond the aim of this

study.

Additional studied material.— ARGENTI-

NA. Chaco, La Leonesa, Río de Oro y R11,

“en selva en galería”, 16-XI-1995, O. Popoff

J. M. Baltazar, M. Rajchenberg: Hypoderma romeroae sp. nov.

118

et al. 2880 (CTES). Formosa, Capital, Guay-

coleq, pr. Arroyo Pilagá, “en selva en gal-

ería”, 16-XI-1995, O. Popoff et al. 2855

(CTES). Misiones, Guaraní, Predio Guaraní,

cerca límite N, 06-IX-1994, O. Popoff et al.

2340 (CTES). PARAGUAY. Alto Paraná,

Reserva Biológica Itabó, Sendero Akutí, 15-

III-1995, O. Popoff et al. 2773 (CTES). BRA-

ZIL. Rio Grande do Sul, São Salvador, J.

Rick Fungi Rickiani 17006 (PACA, lectotype

of L. cinereoalba).

ACKNOWLEDGMENTS

We thank Orlando F. Popoff (CTES, Insti-

tuto de Botánica del Nordeste, Universidad

Nacional de Corrientes, Argentina), Andrea

I. Romero (Curator of BAFC, Universidad de

Buenos Aires, Argentina) and Maria Salete

Marchioretto (Curator of PACA, Instituto An-

chietano de Pesquisas/UNISINOS, Brazil),

for loan of most valuable specimens. We

deeply acknowledge Sergio P. Gorjón (Sala-

manca, Spain) and Shaun R. Pennycook

(Landcare Research, New Zealand) for pre-

submission reviewing this manuscript. A spe-

cial thank and honor to our colleague and

friend Andrea I. Romero, to whom this con-

tribution is dedicated.

REFERENCES

Boidin J., Lanquetin P., Gilles G. 1991. Les Peniopho-

raceae de la zone intertropicale (Basidiomycètes,

Aphyllophorales). A. Espèces paléotropicales.

Bulletin Trimestrele de la Societé Mycologique de

France 107: 91-147.

Galán M., López S. E., Wright J. E. 1993. Corticiaceas

“hyphodermoideas” (Basidiomycetes, Aphyllopho-

rales) de la Provincia de Buenos Aires, Argentina.

Darwiniana 32: 237-256.

Gómez C. E., Loewenbaum M. 1976. Mutatoderma

(Parmasto) C. Gómez, un nuevo género de Cor-

ticiaceae (Basidiomycetes). Boletín de la Sociedad

Argentina de Botánica 17: 345-352.

Hjortstam K., Ryvarden L. 2001. Corticioid species

(Basidiomycotina, Aphyllophorales) from Colombia

III. Mycotaxon 79: 189-200.

Hjortstam K., Ryvarden L. 2007. Checklist of corticioid

fungi (Basidiomycotina) from the tropics, subtro-

pics and the southern hemisphere. Synopsis

Fungorum 22: 27-146.

Jülich W., Stalpers J. A. 1980. The resupinate non-

poroid Aphyllophorales of the temperate Northern

Hemisphere. Verhandelingen Koninklijke Neder-

landsde Akademie van Wetenschappen, Afd.

Natuurkunde, Tweede Reeks, Del 74, 335 pp.

Larsson K.-H. 2007. Molecular phylogeny of Hyphoder-

ma and the reinstatement of Peniophorella.

Mycological Research 111: 186-195.

McKeen C. G. 1952. Studies of Canadian Thelephora-

ceae: IX. A cultural and taxonomic study of three

species of Peniophora. Canadian Journal of Bo-

tany 30: 764-787.

McNeill J., Barrie F. R., Buck W. R., Demoulin V.,

Greuter W., Hawksworth D. L., Herendeen P. S.,

Knapp S., Marhold K., Prado J., Prud’Homme

Van Reine W. F., Smith G. G., Wiersema J. H.,

Turland N. J. 2012. International Code of Nomen-

clature for algae, fungi, and plants (Melbourne

Code): adopted by the Eighteenth International

Botanical Congress Melbourne, Australia, July

2011, vol 154. Regnum Vegetabile. Koeltz Scien-

tific Books, Königstein.

Parmasto E. 1968. Conspectus Systematis Corticia-

cearum. Institutum Zoologicum et Botanicum

Academiae Scientiarium. R.P.S.S. Estonicae,

Tartu, 261 pp.

Popoff O. F. 2000. Novedades sobre ‘corticioides’ y

‘políporos’ (Basidiomycetes) xilófilos del nordeste

argentino. Tesis Doctoral. Universidad Nacional

de Córdoba, 356 pp.

Popoff O. F. 1997. Algunos hongos corticioides (Aphy-

llophorales, Corticiaceae s.l.) del nordeste argen-

tino. Boletín de la Sociedad Argentina de Botáni-

ca. 32: 241-258.

Rick J. 1940. Genus Stereum riograndense. Brotéria

Ciencias Naturais 9: 42-47; 75-90; 139-148.

Tellería M. T., Dueñas M., Beltrán-Tejera E., Rodríguez-

Armas J. L., Martín M. P. 2012. A new species

of Hyphoderma (Meruliaceae, Polyporales) and

its discrimination from closely related taxa.

Mycologia 104: 1121-1132.