SPONDYLOCLADIUM ACROTHECIUM. 421 



curved, 2-3 septate, not constricted at fhe septa, 12- 

 20 x 4 p.. 



Acroihecium delicatulum, B. & Br., Ann. Nat. Hist., n. 

 1055, t. xiv., f. 11 ; Sacc., Syll., iv. n. 2328. 



On decayed beech wood, also on bramble twigs. In the 

 last habitat the hyphae are much scattered. 



Acrothecium simplex. B. & Br. (fig. 22, p. 397.) 



Effused, brownish-olive, erect hyphae simple, wavy, 

 septate, brown; conidia few, springing from the apex, 

 oblong or subclavate, 4-5-septate, at first colourless, then 

 pale brown, 1 6-20 X 5-6 /*. 



Acrothecium simplex, B. & Br., Ann. Nat. Hist., n. 950, 

 t. xvi. f. 16; Sacc., Syll., iv. n. 2330. 



Far. elatum, Grove. Hyphae simple, erect, rather wavy, 

 equal, brown, paler above, 240-280 x 6-7 /A ; conidia 3- 

 septate, often in threes, hyaline, subclavate, 20-22 x 6 /x. 



On nettle stems. 



Acrothecium obovatum. Cke. 



Black, effused, velvety; fertile hyphae simple, septate, 

 sooty, 150 X 5 /A; conidia obovate, 2-septate, 18-20 X 7-8 p., 

 slightly constricted at the septa, sooty, terminal on the 

 fertile hyphae in groups of 4-5. 



Acrothecium obovatum, Cke., Grev., v. p. 50, t. 80, f. 13; 

 Sacc., Syll., iv. n. 2322. 



On dead wood. 



Acrothecium tenebrosum. Sacc. 



Tufts broad, black, fertile hyphae, gregarious, 200 X 3-4 

 /x, erect, septate, simple, base thickened or dilated, blackish- 

 brown, paler upwards ; conidia oblong, ends rounded, curved, 

 tinged brown, somewhat diaphanous, 3-5-septate, 20-25 x 

 5-6 p., springing from minute spinous processes, and form- 

 ing a terminal head. 



Acrothecium tenebrowm, Saoc., Mich., i. p. 74 ; Sacc., Syll., 

 iv. n. 2323. 



On dead wood. 



Spores at first hyaline, guttulate, then pale brown. It 

 does not differ much from Helminthosporium apicale, B. & Br., 

 except in the more numerous and uniformly coloured spores. 

 (Grove.) 



