Heterorepetobasidium subglobosum C. J. Chen & Oberw., Mycologia 94: 515-522. 2002.
Description：
Hyphae basales 1-2 µm in diam. Gloeocystidia rara et inconspicua 15-30 × 8-12 µm, tenuitunicata. Basidia clavata an pyriformia, 15-25 × 8-12 µm. Basidiosporae cylindraceae, 10-11 × 5 µm. Habitatio: In ramis emortuis. Basidiomata thin-resupinate, 30 to 50 µm thick (Fig. 8), fresh whitish to pale cream, dry transparent, very inconspicuous. Hyphae thin-walled, 0.5-1.5 µm in diameter, hyaline, slightly tortuous, embedded in a gelatinous matrix. Hyphidia scattered, developing from subhymenial hyphae, clamped, tortuous and apically branched, growing into the hymenium and interspersed with basidia and gloeocystidia. Gloeocystidia inconspicuous, developing laterally from basal hyphae, thin-walled at maturity, short-cylindrical, 15-30 × 8-12 µm. Basidia obovoid, pyriform or stout clavate 15-25 × 8-12 µm, stalked, stalks up to 10 µm long, mature apically shortly longitudinally cruciate-septate; sterigmata thick, basally swollen, 2-3.5 µm in diam., up to 12 µm long; occasionally basidial development of the Repetobasidium-type. Basidiospores short-cylindrical, 10-11 × 5 µm, smooth, hyaline, nonamyloid, only germination by repetition observed.
Specimens：
Taiwan. Taichung Tashueshan, 2000-2200 m; leg. Chee-Jen Chen CCJ1410.
Habitat：
null
Distribution：
null
References：
Chen, CJ et al. 2002; Donk, MA. 1958; Eriksson, J et al. 1981; Hauerslev, K. 1976; Oberwinkler, F. 1972; Oberwinkler, F. 1982; Rogers, DP. 1935.
Provided：
C. J. Chen
Note：
Heterorepetobasidium species share a unique set of features, i.e., (i) repetobasidia, (ii) apically partially, longitudinally and cruciately septate basidia, (iii) conspicuously swollen sterigmata, (iv) basidiospores germinating by repetition, (v) gloeocystidia often pleurally developed, and (vi) thin, tortuous hyphidia protruding into the hymenium.
A comparison with other similar genera follows. Well developed and old specimens of species of the genus Repetobasidium (Eriksson et al 1981) are easily recognized by columns of generative hyphae, surrounded by old basidial sheaths, and globose, subglobose or short-cylindrical holobasidia with 4 slender sterigmata. Repetobasidium species have no partially septate basidia, no secondary spores and no gloeocystidia. However, their close relationship to heterobasidiomycetous taxa is suggested by the possession of dolipores with continuous parenthesomes. Heterorepetobasidium species share some unique features of Repetobasidium, i.e., septal pore apparatus and repetitive basidial ontogeny.
Renatobasidium notabile Hauerslev (Hauerslev 1993) is characterized by thin basidiomes with longitudinally one-septate, two-sterigmate basidia, developing repetitively, and partly pleural gloeocystidia. Thus, Renatobasidium is a genus of the Auriculariales, related to taxa with tremelloid basidia.
Heterobasidiomycetous species with short cylindrical to globose holobasidia and small, short sterigmata, secondary spores and gloeocystidia-like sterile cells in the hymenium fit the generic concept of Oliveonia Donk (Donk 1958). Oberwinkler (1972) has shown that basidial ontogeny in older specimens of Oliveonia may occur repetitively. Heterorepetobasidium deviates from Oliveonia in having partly septate basidia and stout sterigmata.
Ceratobasidium is typified by C. calosporum D. P. Rogers (1935), a resupinate species, with hyphae without clamps and often branching at right angles, typically stalked and swollen basidia with stout sterigmata, and basidiospores germinating by repetition. A restudy of the type material showed that the basidia are apically partially cruciately septate (Oberwinkler 1982). In addition, the septal pore apparatus was found to be a dolipore with continuous parenthesomes (Oberwinkler 1982). There is no basidial repetition and cystidia, inclusive of gloeocystidia and hyphidia, are lacking. Both the genus Ceratobasidium and the family Ceratobasidiaceae, have to be based on these major features of the type species. It is therefore clear that species with holobasidia do not fit the generic concept of Ceratobasidium in a strict sense, and most of the species currently assigned to this genus are systematically misinterpreted. Thus those taxa, which do not share the Ceratobasidium dolipore type, should not be assigned to this genus. Furthermore it is evident that Ceratobasidium belongs in the Auriculariales, and it is unclear whether the Ceratobasidiaceae can be maintained as a separate family. Consequently, the Ceratobasidiales are suggested to a synonym of the Auriculariales.
Phylum：Basidiomycota >> Class： Basidiomycetes >> Order： Auriculariales 
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