SPONDYLOCLADIUM — ACROTHECIUM. 421 



ciivved, 2-3 septate, not constricted at the septa, 12- 

 20 X 4 /x. 



Acrothecium 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 hvphae are much scattered. 



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



Efi'used, 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, ] 6-20 X 5-Q /x. 



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

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



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

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

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



On nettle stems. 



Acrothecium. obovatum. Cke. 



Black, efi'used, velvety; fertile hyphae simple, septate, 

 sooty, 150 X 5 fx; conidia obovate, 2-septate, 18-20 x 7-8 /x, 

 slightly constricted at the septa, sooty, terminal on the 

 fertile hyj^hae in groups of 4-5. 



Acrothecium obovatum, Cke., Grev., v. p. 50, t. 80, f. 3 3; 

 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 /x, springing from minute spinous processes, and form- 

 ing a terminal head. 



Acrothecium tenebrosum, Sacc, Mich., i. p. 74; Sacc, Syll., 

 iv. n. 2323. 



On dead wood. 



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

 does not difi'er much from Melminthosporium apicale, B. & Br., 

 except in the more numerous and uniformly coloured spores. 

 (Grove.) 



