Inonotus micantissimus (Rick) Rajchemb.

Nordic Journal of Botany 7 (5): 565 (Rajchenberg 1987).

Phellinus macrosporus Gibertoni & Ryvarden, Synopsis Fungorum 18: 51 (2004).

SPECIMENS EXAMINED. — Argentina, Missiones, Iguazu National Park, III.1982, L. Ryvarden (O[O919343]) — Brazil. Alagoas State, Quebrangulo City, REBIO de Pedra Talhada, on dead wood, 09°15’29.0”S, 36°25’52.0”W, 614 m, 3.VII.2017, V. Xavier de Lima PPT6, (URM[URM90186]); 3.VI.2017, V. Xavier de Lima PPT132, (URM[URM91180]); Bahia State, Salvador, on Nectandra sp., III.1944, J. Rick, (PACA-Fungi[20691, holo-]); Pernambuco State, Recife, Parque Estadual Dois Irmãos, XI.2001, Phellinus macrosporus (URM[URM77582, holo-]); Rio Grande do Sul State, Santa Maria, Cerrito, VI.1984, G. Coelho (O[O919342]); Parque Pinhal, VI.1992, G. Coelho (O[O919346]); Santa Maria, IX.1995, G. Coelho (O[O919344]); São Paulo State, Cananéia, llha do Cardoso, II.1987, D. Pegler, K. Hjortstam & L. Ryvarden (O[O910345; O919341]); Costa Rica, Puntaneras, La Amistad Pacifico, Estación Biológica Las Tablas, Finca Cafrosa, IX.2000, L. Ryvarden (O[O506129]); Dominican Republic, Cordillera Central, La Veja, Rreserva Científica Ebano Verde, II.1998, P. Perdomo (O[O906277]); United States of America, Virgin Islands, St. John Island, IX.2004, C. Vlaskova (O[O919340]); Florida, Miami, Mathesons Hammock, VIII.2010, J. Vlasák (O[O505347]).

REMARKS

The recently collected specimens(URM90186 and URM91180) are identical to the holotype of I. micantissimus (Fig. 3 A-D). The large tramal setae (Fig. 3B) and large subglobose basidiospores (Fig. 3D) make this a very distinctive species in Hymenochaetaceae . The type of P. macrosporus was also analyzed, and our observations agree with Gibertoni et al. (2004). The species is characterized by the resupinate basidiomata, 7-8 pores/mm, presence of tramal and hymenial setae, globose, hyaline basidiospores, 6.2-12.4 Μm in diam. Basidiospores are very similar in both types, being slightly larger in I. micantissimus . The current basidiospore measures from the type of I. micantissimus (10-13 × 8-10) were slightly different from those reported by previous works (Rajchenberg 1987; Ryvarden 2004: 10-13 × 8-12 Μm). Basidiospore size and color seem to be a weak taxonomic character to distinguish these two species from each other, since their size overlap and the differences in the L (1.83 Μm) and W (2.59 Μm) averages among the species are in the range of the basidiospore variation within each species. Additionally, basidiospore color varies even in the same specimen. Thus, the synonymization of P. macrosporus to I. micantissimus is proposed.