316 FUXGUS-FLOKA. 



lets, that bear the imperfect, greenish heads of conidia; 

 conidia globose, pale dingy green, 2 /x diameter. 



Botrytis virella. Fries, Summa. Veg. Sc, p. 491 ; Sacc, 

 SylL, n. 663. 



On very wet and rotten wood. 



***** Brownish or darJc-coloured. 



Botrytis Tilletii. Desm. 



Forming dense and often broadly effused, fawn-coloured or 

 brownish expansions ; sterile hyphae 8-10 /x. thick, septate, 

 branched, interwoven ; fertile, same thickness, short, erect, 

 irregularly or imperfectly verticillately branched near the 

 apex, tips of the branchlets spinulose and bearing numerous 

 elliptical or subglobose conidia, 4 x 3 or 4 /t diameter. 



Botrytis Tilletii, Desm., Ann. Sci. Nat. (1838), vol. x. 

 p. 308 ; Sacc, SylL, n. 660. 



Eunning over moss, leaves, wood, &c. 



Botrytis croci. Gke. & Mass. 



Small dark smoky tufts, sometimes confluent and effused ; 

 threads thick, rather closely septate, slightly branched at 

 the attenuated tips, pale olive below, colourless above ; 

 conidia elliptical, continuous, hyaline, 15-18 x 8-10 /jl, 

 collected at the tips of the branches in small heads of from 

 3-8 conidia. 

 y Botrytis croci, Gke. & Mass., Grev., xvi. p. 10. 



On dead leaves of Crocus. 



B. Polyactis. Link. 



Large, rather rigid, forming brownish-grey tufts ; branches 

 thickish, obtuse, usually with scattered tooth-like projections 

 arranged in a racemose or corymbose manner, and bearing 

 the conidia. 



Botrytis vulgaris. Fr. 



Tufts greyish-olivo, scattered; often becoming confluent, 



fertile hyphae septate, ascending or erect, olive, branched 



near the tip ; primary branches short, spreading, bearing a 



few short branchlets usually arranged in pairs; conidia 



