108 FUNGUS-FLORA. 



leaves, twigs, &c., or passing into cristate ascending "branches 

 i 1 in. high. Not byssoid and silky when young. 



Soppittiella Crustacea. Mass. 



Umber-brown with sometimes a purple tinge, broadly 

 incrusting, rather fleshy, margin fibrillose, whitish; hy- 

 menium irregularly papillose ; spores globose, rough, vinous- 

 brown, 9-11 /A. 



Thelephora Crustacea, Fr., Hyrn. Eur. (537; Stev., Brit. 

 Fung. 266. 



Eunning over the ground, moss, &c. Distinguished by 

 the brown colour and white fibrillose margin; sometimes 

 effused in an irregular manner for several inches. 



EXOBASIDIUM. Woronin. (fig. 22, p. 97.) 



Parasitic on living plants, leaves more especially, which 

 in consequence become variously deformed ; basidia crowded, 

 cylindric-clavate, tetrasporous ; spores elliptic-oblong, often 

 unequilateral, continuous, colourless. 



Exobasidium, Woronin, in Verhandl. Nat. Ges. Freib. iv. 

 fasc. iv. (1867); Sacc., Syll. vi. p. 664. 



A very peculiar and anomalous genus, the vegetative 

 hyphae remain immersed in the root, the basidia, which are 

 olosely packed and form a hymenium, being alone developed 

 on the surface. Most nearly allied to Corticium, but distin- 

 guished by being a true parasite. 



Exobasidium vaccinii. Woronin. (fig. 22, p. 97.) 

 Innate, effused, form various, usually orbicular or elon- 

 gated, fleshy, often becoming confluent; hymenium protruding 

 from the under surface of the leaves or the stem, flesh- 

 coloured with a white bloom ; spores elongato-fusoid, colour- 

 less, straight, 5-8 x 1-2 //.. 



Exobasidium vaccinii, Woronin, in Nat. Ges. Z. Freib., 

 b. iv. Heft iv. ; Sacc., Syll. vi. n. 7795. 



On living leaves, rarely on stems and petioles of Vaccinium 

 myrtillus. lied or purple patches occur on the upper surface 

 of the leaves opposite to the portion occupied by the fungus 

 below. The fungus occurs on other species of Vaccinium, also 

 on species of Andromeda and Acrostaphylos in various parts of 

 Europe. 



