Fig. 5

Octaviania tomentosa. a–b Basidiomata (a holotype from central Honshu, Japan [KPM-NC 27954]; b specimen from Amami-oshima Island, Japan [KPM-NC 23934]). c Basidiospores under SEM (holotype). d section of a basidiospore showing multiple slit-like cavities inside the spiny ornaments. e Basidiospores mounted in water (KPM-NC 27945). f Dextrinoid basidiospores with elongated ornamentation mounted in lactic acid after pre-soaking in Melzer’s reagent (KPM-NC 23934). g Basidiospores connected to 4-spored basidia (arrows; KPM-NC 27955). h Peridium of an immature basidiome (KPM-NC 27955). i Peridium of a mature basidiome (KPM-NC 27953). Scale bars: a–b = 1 cm, c, e–f = 10 μm, d = 5 μm, g, i = 20 μm, h = 50 μm