370 FUNGUS-FLORA. 



Periconia byssoides, Pers., Syn., p. 686; Sacc., Syll., 

 n. 1310. 



On decaying herbaceous stems, leaves, &c. 



The discrepancy between rough and smooth conidia may 

 very possibly be due to difference of age in the specimens 

 examined. 



Periconia atra. Corda. (fig. 14, p. 358.) 

 Forming blackish-brown, very thin stains ; fertile hyphao 

 very delicate, wavy, septate, sooty, somewhat incrassated at 

 the base ; head almost globose ; conidia subglobose, with an 

 apiculus, brown, rather pellucid, smooth, 4-5 //, diameter. 



Periconia atra, Corda, Icon. Fung., vol. i. p. 19, f. 258 : 

 Sacc., Syll., vol. iv. n. 1311. 



On culms of grass, dead herbaceous stems, &c. 



Periconia nigrella. Sacc. 



Very minute, black, scarcely t? ram. high, fertile hyphae 

 simple, very slender and rather attenuated upwards, 3-5- 

 septate, dark brown ;* conidia globose, smooth, brown, 5 /u. 

 diameter, forming a compact globose head. 



Periconia nigrella, Sacc., Syll., iv. 1328. 



Sporocybe nigrella, Berk., Ann. Nat. Hist., n. 226, t. xiii. 

 f. 16. 



On fallen grass, leaves. 



Periconia alternata. Sacc. 



Forming minute, greyish-black, suborbicular tufts ; sterile 

 hyphae decumbent, slender, fertile ascending or erect, 

 branched in a zigzag manner; tips of fertile branches 

 swollen; conidia oblong, truncate at both ends, brown, 

 7-8 X 5 /i, compacted to form a globose head. 



Periconia alternata, Sacc., Syll., iv. n. 1332. 



Sporocybe alternata, Berk, in Cooke's Hdbk., n. 1698. 



On damp paper. 



Periconia podospora. Corda. 



Tufts brown ; hyphae erect, flexuous or wavy, brown, 

 semipellucid ; septate, inflated and club-shaped at the apex ; 

 conidia subglobose or obovate, brown, with a minute hyaline 

 pedicel, 8-9 p. diameter, aggregated to form an oblong or 

 elliptical head. 



