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Literature:
 
Page number:318 
Remarks (internal):Jülich (1980) described the new genus Tremellacantha and a new family, Tremellacanthaceae, to accommodate this species. However, he mentioned no records, nor discussed the type of Hydnum sclerodontium. We are convinced that this species is closely related to Protohydnum A. Möller (1895), being very similar to P. cartilagineum A. Möller (1895, fig. 35). Compare also the description by Lowy (1971). It is not known whether or not P. cartilagineum has a dimitic structure, but a specimen from Panama (Canal Zone, Port Sherman, 5 Aug. 1945, G. W. Martin 6152, K) which seems to be this species, though in rather poor condition, is undoubtedly dimitic. Unfortunately, the type of P. cartilagineum has not been available from Berlin for study.
The genus Protohydnum was placed in Tremellaceae by Jülich (1981) and we agree with this arrangement. Consequently, we consider Tremellacantha to be a synonym of Protohydnum P. Möller and that Tremellacanthaceae should be placed in synonymy with Tremellaceae.
 
Description type:Non-original description 
Description:Protohydnum sclerodontium (Berk. & Mont.) Hjortst. & Spooner comb. nov. (Fig. 5 A-F).
Hydnum sclerodontium Berk. & Mont., Hooker's Lond. Journ. Bot. 3: 333 (1844). Type: Java, leg. Spanoghe (holotype K).
Basidiome resupinate, adnate, more ore less gelatinous in the living state, when dried hard and membranous, 0.1-0.25 mm thick; hymenophore strongly hydnoid, aculei slender, 5-10 mm long x 0.1-0.25 mm diam., smooth, acute, sometimes with short branches 0.5-1 mm long, pale rusty brown and often with a reddish tint. Hyphal system dimitic; generativc hyphae with clamp-connexions, thin-walled, (1.5-)2.0-3.0 µm wide; skeletal hyphae dominating, thick-waffed, (2 .0-)2.5-4.0(-5.0) µm wide, occasionally branched, without clamp-connexions but often with adventitious septa. Cystidia generally few and not well differentiated, somewhat moniliform, thin-walled or sometimes rather thick-walled, c:. 25-30 x 5-6 µm. Basidia at first sphaeropedunculate, then obliquely to cruciately septate, c. (10-)15-25 x 8-10 µm, with four rather stout sterigmata and a basal clamp-connexion. Spores cylindrical to more commonly slightly allantoid, hyaline, thin-walled, smooth, 11-14 x 3.5-3.8 µm.
 
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