428 FUNGUS-FLORA. 



Coniothecium betulinum, Corda, Icon. Fung., i. p. 2, t. 1, f. 25 ; 

 Sacc., Syll., iv. n. 2428. 



On dead branches of Betula alba. 



Coniothecium viticolum. C. & M. (fig. 14, p. 397.) 



Tufts erumpent, hemispherical, black, rather compact, 



loosely gregarious; conidia rounded, subglobose, variously 



agglutinated together, with 2-4 cells, usually in fours, pale 



olive, 1215 fjL diameter. 



Coniothecium viticolum, C. & M., Grev., xvi. p. 9. 

 On dead twigs of vine (Vitis vinifera). 



DICTYOSPOKIUM. Corda. (fig. 20, p. 397.) 



Conidia ovoid, or more or less cordate, formed of aggluti- 

 nated, parallel rows of articulated filaments that do not 

 separate from each other, without appendages. 



Dictyosporium, Corda, Icon., Fung., ii., p. 87 ; Sacc., Syll., 

 iv. p. 513. 



Dictyosporium elegans. Corda. (fig. 20, p. 397.) 

 Growing on wood ; tufts effused, black ; conidia tongue- 

 shaped, apex acute or rounded, rarely more or less contracted 

 at the centre, base attenuated or cordate, cells diaphanous, 

 yellow 4-5 rows, walls rather thick, brown or blackish, 

 57-60 p. long. 



Dictyosporium elegans, Corda, Icon. Fung., ii. p. 87 ; Sacc., 

 Syll., iv. n. 2451. 



On rotten wood of oak, pine, &c. 



SPEIKA. Corda. (fig. 27, p. 397.) 



Conidia muriformly septate, sooty, formed of chains of 

 cells that eventually separate, without appendages, base 

 shortly stipitate or almost sessile. 



Speira, Corda, Icon. Fung., i. p. 9 ; Sacc., Syll., iv. p. 514. 



Somewhat like Dictyosporium, but distinguished by the 

 chain of cells forming the spore opening out at maturity. 



