PERIOONIA. 369 



flexuoMS, 150-200 X 6 /i diameter, thinner upwards, tase 

 somewhat bulhous, apex crowned with 5-6 hyaline, simple 

 conidiophores arranged in a compact verticil, 12-15 and S-i/j.;. 

 conidia blackish-olive, oUong (spurionsly ?) 1-septate, apex 

 ohtnse, base obliqne and attenuated, involved in mucus 

 and crowded together to form a spherical, black, shining 

 head. 



Stachyhotrys dichroa. Grove, in Sacc, Syll., iv. n. 1306. 



On rotten stem of Carduus palustris. 



Stachybotrys asperula. Mass. (fig. 13, p. 318). 



Effused; black. Hyphae abundant, creeping, dichoto- 

 mously branched, ascending, minutely rough, the tips 

 crowned with pale, clavate conidiophores ; conidia globose, 

 blackish-brown, opaque, minutely rough, 7-10 /j. diameter. 



Stachybotrys asperula, Mass., Grevillea, vol. xvL p. 26. 



On damp paper that had come from Ceylon, hence the 

 fungus may possibly be an introduced species, although first 

 noticed at Kew. 



PEEICONIA. Bon. (fig. 14, p. 358.) 



Sterile hyphae creeping, often -obsolete, fertile brown, 

 simple or with one or two short branches ; conidia usually 

 globose, brown, not catenulate, forming a compact head at 

 the apex of the stem. 



Periconia, Bonord., Hdbk., p. 112 ; Sacc, Syll., iv. p. 270. 



Distinguished from Sporocybe by the stem consisting of a 

 single hypha, whereas in the last-named genus the stem is 

 composed of a compacted bundle of hyphae. Differs from 

 Stachybotrys in the absence of conidiophores or short branch- 

 lets bearing the conidia at the apex of the stem. 



Periconia byssoides. Pers. 

 Forming small black patches ; fertile hyphae simple, erect, 

 up to 1 mm. high, slightly attenuated upwards, apex, 

 whitish, and slightly inflated, remainder dark brown, septate ; 

 head globose, compact; conidia subglobose, apiculate, 5-7 fx. 

 diameter, dark brown, srnooth (Berkeley says minutely 

 echimilate). 



VOL. III. 2 B 



