Abstract
Three new species in Hymenochaetaceae are illustrated and described from tropical Ecuador and Peru based on morphology and phylogenetic analyses. The species Fomitiporiarobustiformis is characterized by perennial, pileate basidiocarps; ungulate pilei; brown and glabrous pileal surface; broad and rounded margin; yellowish-brown pore surface; circular to angular pores measuring 6-7 per mm; thick and entire dissepiments; a dimitic hyphal system; the presence of fusoid cystidioles; the presence of hymenial setae; and globose basidiospores measuring 5-6.4 × 4.7-6.1 µm. Fomitiporiaroseo-bubalina is characterized by annual to perennial, resupinate to pileate basidiocarps; ungulate to triquetrous pilei; grayish and glabrous pileal surface; blunt margin; pale gray and glossy pore surface; circular to angular pores measuring 4-5 per mm; thick and entire dissepiments; a dimitic hyphal system; the presence of hymenial setae and cystidioles; and globose basidiospores measuring 5.3-6.7 × 5-6.2 µm. Fomitiporiatriqueter is characterized by perennial, pileate, sessile basidiocarps; triquetrous pilei with sharp margins; grayish dark and cracked pileal surfaces with concentrically sulcate, pale yellowish brown pore surfaces; circular pores measuring 9-10 per mm; the absence of hymenial setae and cystidioles; the presence of large rhomboid crystals in the hymenium; and globose basidiospores measuring 3.4-5.5 × 3.2-5.4 µm. The differences between the new species and morphologically similar and phylogenetically related species are also discussed.