BOSTEIOHONEMA— DACTYLIUM 311 



constricted, sliglitly thinner towards the tip ; conidia pro- 

 duced at the apex (and laterally ?), elliptical, for a lony; 

 time 1-celled, then 2-celled and slightly constricted at thu 

 septum, 20-22 X 14^15, colourless, curved, at length 

 asperulate. 



Boslrichonema alpestre,' Cesstti, Erh. Critt. Ital., n. 149; 

 Sacc, Syll. iv. n. 909. 



On living leaves of Polygonum, historta, P. vivipara, &c. 



Bostrichonema modestum. Sacc 



"White, springing from brownish spots ; hyphae almost 

 straight or slightly wavy, about 100-7 /x.; conidia eUiptic- 

 oblong, 1-septate, constricted, 24-27 x 8—10 /x. 



Bostrichonema modestum, Sacc, Syll., n. 910. 



Dactylium modestum. Berk, and White, Scottish Xat., voL iv. 

 p. 162, t. 2, fig. 2. 



On the under surface of fading leaves of Alchemilla alpina. 



Sect. III. PHRAGMOSPORAE. Sacc. 

 Subsect. 1. Macronemeae. Sacc. 

 Tribe 8. Dactylieao. Sacc. 

 DACTYLIUil. Nees. (fig. 26, p. 274.) 



Saprophytes. Sterile hyphae creeping, fertile ascending, 

 repeatedly branched in a verticillate manner, or (in the sub- 

 gen. HelmintJiopJiora) once verticillately branched. Conidia 

 oblong, 2 or many septate, colourless, subsolitary at the 

 tips of the branchlets. 



Dactylium, Fries, Syst. Myc, iii. p. 413; Sacc, Syll., iv. 

 p. 189. 



Dactylium dendroides. Fries, (fig. 26, p. 274.) 

 Forming whitish, effused, byssoid tuits ; fertile hyphae 

 erect, septate, main branches usually subopposite, branchlets 

 in whorls of three as a rule, tips thin ; conidia oblong, 

 apiculate at the base, 3-septate, scarcely constricted at the 

 sspta, colourless, 26-32 x 10-13 yx. 



