Hypomyces melanocarpus Rogerson & Mazzer, Michigan Bot. 10: 109, 1971. 

Anamorph: Sepedonium sp.


Teleomorph in nature: Subiculum effuse, olive brown(Munsell 5Y6/2) to olive(5Y7/2), grayish yellow(5Y7/6), covering entire surface of hymenium; hymenial hyphae 3-5.5m  in widt, parenchymatous, septate, thick-walled and KOH (-). Perithecia olive brown,(5Y5/4)to olive(10Y4/2), obpyriform to broadly ellipsoidal, (230-)265-280(-310)~(230-)280-310(-330) m, born in groups immersed in the mycelia; papilla conical, (100-)120-130(-145)~(100-)145-185(-200) m. Asci cylindrical, (120-)136-157(-171)~(4.5-)5.5-6.5(-8) mm, eightspored with a stalk (22.5-)25.5-27 (-32) m long, forming a pore at the slightly thick-walled apex. Ascospores hyaline, fusiform, aseptate, (24-)27-29 (-35)~5-5.5(-7) m, verrucose with warts of <0.5 mm in diameter, apiculate but sharp-angled at both ends; apiculi 2.5-3 m long. 
Characteristics in culture: Colonies on MEA, grow rapidly to reach 10?15 mm in diameter. after 7 days at 25oC, floccose, grayish yellow(5Y8/2) to birch gray(10YR7/2), margins dentate, odor none, reverse grayish brown(10YR6/2) to brownish orange(10YR7/4).  Hyphae are hyaline, septate, thick-walled, 3-5.5(-11) m.  Conidiophores born from aerial hyphae, semi-macronematous, septate, slightly thick-walled, two to three times branched irregularly, 3-3.5(-5) m wide, forming conidiogenous cells at the apex. Conidiogenous cells born laterally or as a main branch of conidiophores, solitary or in a well-developed verticil of 2-5 on the conidiophores, hyaline, (17.5-)53-75 (-145)~(1.5-)2.5-3.5 m, lanceolate, gradually tapered to the apex of 1-2 (-2.5) m in width. Conidia solitary to clusters from the apex of conidiogenous cells, hyaline, aseptate, cylindrical to long ellipsoidal, thin-walled, smooth, (5.5-)11-13 (-21)~(2-)3-5 m. Chlamydospores produced laterally on the substrate hyphae or terminally at the apex of the branches, grayish brown(10YR5/2) to birch gray(10YR7/2), verrucose, globose, 9-13(-17.5) m in width.

Habitat: parasitic on Tylopilus valens (Corner) Hongo & Nagas.
Tokiwa T, Okuda T (2009) Japanese species of Hypomyces and their anamorphs IV. Nippon Kingakukai Kaiho 50: 94-103 (in Japanese)