Fuscoporia is a cosmopolitan, poroid, wood-decaying genus, belonging to the Hymenochaetales. During a study of wood-inhabiting fungi in the USA, four unknown specimens were collected from Hawaii. Both morphological criteria and molecular genetic analyses based on the ITS+nLSU+EF1-α datasets and the nLSU dataset confirmed that these four specimens represent two new species of Fuscoporia, and they are described as F. hawaiiana and F. minutissima. Fuscoporia hawaiiana is characterized by pileate basidiocarps, the absence of cystidioles, hooked hymenial setae, broadly ellipsoid to subglobose basidiospores measuring 4-6 × 3.5-4.5 μm. Fuscoporia minutissima is distinguished by small pores (10-13 per mm) and basidiospores (3.4-4 × 2.4-3 μm). The taxonomic status of the two new species is briefly discussed. A key to the North American species of Fuscoporia is provided.

• Klíčová slova
• Hymenochaetaceae, new taxa, phylogeny, polypore, taxonomy,
• MeSH
• Basidiomycota * genetika   MeSH
• DNA fungální genetika   MeSH
• fylogeneze MeSH
• sekvenční analýza DNA MeSH
• spory hub genetika   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Havajské ostrovy MeSH
• Názvy látek
• DNA fungální MeSH

Two new species in Hymenochaetaceae, Fulvifomes acaciae and Pyrrhoderma nigra, are illustrated and described from tropical Asia and America based on morphology and phylogenetic analyses. F. acaciae is characterized by perennial, pileate, and woody hard basidiomata when fresh; ash gray to dark gray, encrusted, concentrically sulcate, and irregularly cracked pileal surface; circular pores of 7-8 per mm with entire dissepiments; a dimitic hyphal system in trama and context; absence of setal element and presence of cystidioles; and broadly ellipsoid, yellowish brown, thick-walled, and smooth basidiospores measuring 5-6 μm × 4-5 μm. P. nigra is characterized by perennial and resupinate basidiomata with dark gray to almost black pore surface when fresh; small and circular pores of 7-9 per mm, a monomitic hyphal system with generative hyphae simple septate, hyphoid setae dominant in subiculum but not in tube trama, and absence of cystidia; and ellipsoid, hyaline, thin-walled basidiospores measuring 4-5 μm × 3-3.6 μm. The differences between the new species and morphologically similar and phylogenetically related species are discussed. Keys to Fulvifomes and Pyrrhoderma have also been provided.

• Klíčová slova
• Hymenochaetaceae, polypore, taxonomy, white rot, wood-decaying fungi,
• MeSH
• Basidiomycota * genetika   MeSH
• DNA fungální genetika   MeSH
• fylogeneze MeSH
• mezerníky ribozomální DNA genetika   MeSH
• ribozomální DNA MeSH
• sekvenční analýza DNA MeSH
• spory hub MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Asie MeSH
• Názvy látek
• DNA fungální MeSH
• mezerníky ribozomální DNA MeSH
• ribozomální DNA MeSH