400 FUNGUS-FLORA. 



Clasterosporium hirundo. Sacc. 



Densely and indeterminately effused, jet-black ; creeping 

 hyphae scanty, filiform, septate, sooty, then disappearing; 

 fertile hyphae very short; conico-cylindrical, erect, sparingly 

 septate, sooty ; conidia very long, worm-like, often curved, 

 somewhat constricted here and there, attenuated upwards, 

 apex rounded, base wedge-shaped, truncate, septa crowded, 

 joints numerous (55-65), 200-230 x 15 fi, sooty-black. 



Clasterosporium hirundo, Sacc., Mich., i. p. 85; Sacc., Syll., 

 iv. n. 1814. 



On rotten oak wood. 



The typical form has not yet been recorded for Britain. 



Var. Anglicum. Grove, Journ. Bot., 1886, p. 14, t. 267, 



I. O. 



Forming aggregated, oblong or elongated, velvety, jet- 

 black spots ; hyphae somewhat fasciculate, short, cylindrical, 

 septate, 2550 x 68 p., fuscous ; conidia sooty-brown, 

 300-400 //. or even up to 450 p. long, lanceolate below, 15 /*. 

 thick, attenuated upwards into a very long, cylindrical 

 beak 6-8 /x, thick, 50-60-septate, cells of beak quadrate, apex 

 truncate, not paler. 



On dead wood. 



Var. minus. Grove, Journ. Bot., 1886, p. 14. 



Densely gregarious, forming effused black spots ; conidia 

 lanceolate, attenuated into a long, cylindrical beak, 100-200 /A 

 long, 10-12 p (beak 4-5 /A) thick, blackish-brown, semi- 

 pellucid, 30-50-septate ; conidiophore short or elongated, 

 rigid, 3-5 -septate. 



On rotten wood. 



Clasterosporium hormiscioides. Sacc. 



Effused, black, velvety; fertile hyphae or conidiophores 

 2-4 septate, ochraceous, 20-30 x 6 p : conidia worm-like, 

 conico-cylindrical, 150-180 x 12-15 /*, tortuous, 35-45 

 joints, smoky-brown, 1-2 terminal joints hyaline and more 

 or less swollen. 



Clasterosporium hormiscioides, Sacc., Syll., iv. n. 1815. 



On rotten wood and branches. 



Clasterosporium vermiculatum. Cke. (fig. 8, p. 397.) 

 Effused, thin, black; mycelium creeping, simple or 



