352 FUNGUS-FLORA. 



Helicomyces tululosus, Eiess, Bot. Ztg,, 1853, p. 140, t. iii. 

 f. 11-13; Sacc., Syll., iv. n. 1120. 

 On rotten wood. 



Fam. II. DEMATIEAE. Fries. 



Hyphae forming a cottony or byssoid expansion, brown or 

 black, rather rigid, threads lax, crowded but not aggregated 

 in definite fascicles or heads. Hyphae and conidia typically 

 blackish-brown, but in some cases the hyphae arc hyaline 

 and the conidia dark; in others the hyphae are dark and 

 the conidia almost colourless. 



In the present family the hyphae and conidia are never 

 both colourless in the same fungus, there is also an absence 

 of bright, clear colours, the predominating shade being 

 blackish or olive-brown, the colour being in many cases so 

 intense that the hyphae and conidia are quite opaque. 



Sect. I. Amerosporae. Sacc. 



Conidia globose, elliptical, or oblong, blackish or some- 

 what hyaline, continuous, the hyphae always brown. 



Subsect. 1. Micronemeae. Sacc. 



Hyphae almost obsolete or very short, scarcely distinct 

 from the conidia. 



Tribe 1. Conlosporieae. Sacc. 

 Conidia not catenulate. 



Tribe 2. Toruleae. Sacc. 

 Conidia catenulate. 



Tribe 3. Echinobotryeae. Saoc. 

 Conidia crowded in small heads or racemos. 



