370 FUNGUS-FLORA. 



Periconia hyssoides, Pers., Syn., p. 686 ; Sacc, Sjll., 

 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 hyphae 

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

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

 apiculus, brown, rather pellucid, smooth, 4—5 fx 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 -J mm. high, fertile hyphae 

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

 septate, dark brown ; conidia globose, smooth, brown, 5 /x, 

 diameter, forming a compact globose head. 



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



Sporocyhe 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 IX, 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 /x diameter, aggregated to form an oblong or 

 elliptical head. 



