726 HELICOBASIDIUM. PLATYGLOEA 



1. Parasites, with or without probasidia. 

 PUCCINIINEAE ~\ 



COLEOSPOEIINEAE f Not dealt with in the present work. 

 USTILAGINEAE J 



2. Saprophytes, without probasidia. 



AURICULARIINEAE. 

 Hymenium fully exposed from the first. 



AURICULARIACEAE. 



Same characters as suborder. 



Helicobasidium Pat. 

 (e\t, twisted; basidium, a basidium.) 



Receptacle membranaceous, soft, floccose; effused, incrusting. 

 Hymenium smooth. Basidia cylindrical, more or less incurved, trans- 

 versely 2-4-septate, with subulate, unilateral sterigmata. Spores 

 white, oval, or pear-shaped, smooth, producing, on germination, 

 either sporidiola, or a mycelium. Growing on humus, or wood. 



2478. H. purpureum (Tul.) Pat. (= Corticium lilacinum Quel.) Trans. 

 Brit. Myc. Soc. in, t. 7. Purpureum, purple. 



R. 3-6 cm., dingy reddish purple, margin paler, broadly effused, in- 

 crusting, indeterminate, adnate, inseparable. Hymenium concolorous, 

 then deep vinous colour, and covered with a white pruina. Flesh 

 whitish, floccose, loose, thin. Spores white, pear-shaped, 10-12 x 

 6-8 JLI; basidia cylindrical, incurved, 3-5 /u, in diam., 3-septate. Basal 

 hyphae pale brown, 4-7 (JL in diam., septate, without clamp con- 

 nections. Half buried ash bough amongst leaf debris. March. Rare. 

 (v.v.) 



Platygloea Schroeter. 

 (7r\aTv<;, broad; y\oia, glue.) 



Receptacle homogeneous, waxy, gelatinous, or coriaceous gela- 

 tinous, tubercular, wart-like, or consisting of spreading, or erect, 

 convolute plates. Hymenium smooth, unilateral, or amphigenous; 

 basidia cylindrical, straight, palisade-like, transversely septate, with 

 long sterigmata. Spores white, oval, or elliptical, obtuse, or apiculate, 

 straight, or curved; producing sporidiola on germination. Growing 

 on dead wood. 



2479. P. efiusa Schroet. Trans. Brit. Myc. Soc. vi, text-figs, p. 138. 



Effusa, spread out. 



R. greyish, then whitish, effused, closely adnate, thin, subgelatinous, 

 firm. Hymenium concolorous, pulverulent under a lens. Spores white, 

 smooth, elliptical, or ovate, with an oblique apiculus, 7-8-10 x 4-5 /x; 



