282 FUNGUS-FLORA. 



Pusidium griseum. Link. 



Forming small isolated patches, wliich Tisually combine to 

 form broadly extending, extremely thin films, mycelium very 

 thin, evanescent ; conidia concatenate, fusiform, colourless, 

 6-7 X 1-5^. 



Fusidium griseum, Link., Ohs., i. p. 6 ; Sacc, Syll., iv. 105. 



On dead dry oak and beech leaves. Not common. 



Sometimes covering the greater part of the under surface 

 of the leaf. Care must be taken not to confound the present 

 species with Cylindrinum griseum, Bon., a much commoner 

 mould on dead leaves, and presenting a similar superficial 

 appearance. 



Fusidiusn asteris. P. & P. 



Tufts crowded in the centre, scattered at the margin; 

 conidia emerging from the leaves in clusters, cylindrical, 

 25 fi. long, intermixed with mycelial threads. 



Fusidium asteris. Plow. & Phill., Grev. ; Sacc, Syll., 

 n. 125. 



On both sides of dying leaves of Aster tripdlium. 



Fusidium. deutziae. Cooke. 



Forming small, powdery, convex, flesh-coloured tufts on 

 under surface of the leaves; conidia fusiform, straight 

 hyaline, continuous, 18-20 X 3-4 ju, seated on very short 

 conidiophores. 



Fusidium deutziae, Cke., Grev., v. 16, p. 48. 



On fading leaves of Deutzia. 



Fusidium sulphureum. Link, is stated in Cooke's list of 

 British Hyphomycetes to have occurred at Appin, N.B. An 

 examination of Carmichael's specimen, now in the Kew 

 Herbarium, shows it to be Oylindrium flavo-virens, Ditm. 



Fusidium lycotropum. Pr. 



White, thinly effused; conidia Curved like a horse- 

 shoe, hyaline, fusiform, obtuse at each end, 2-4 guttulate, 

 18-20 X 3 /*, the two inner guttulae almost always very 

 large. 



Fusidium lycotropum. Pr., St. Deutschl. Fl., xxix. 57, t. 29; 

 Grove, Journ. Bot. (1886), p. 10. 



