BOSTBIOHONEMA DACTYLIUM 311 



constricted, slightly thinner towards the tip; conidia pro- 

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

 time 1-celled, then 2-celled and slightly constricted at tin* 

 septum, 20-22 x 14-15, colourless, curved, at lengtli 

 asperulate. 



Bostrichonema alpestre, Cesati, Erb. Critt. Ital., n. 140 ; 

 Sacc., Syll. iv. n. 909. 



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



Bostrichonema modestum. Sacc. 



White, springing from brownish spots ; hyphae almost 

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

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



BostricJionema modestum, Sacc., Syll., n. 910. 



Dactylium modestum, Berk, and White, Scottish Nat., vol. iv. 

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



On the under surface of fading leaves of Alchemilla aljpina. 



Sect. III. PHRAGMOSPORAE. Sacc. 

 Subsect. 1. Macronemeae. Sacc. 



Tribe 8. Dactylieao. Sacc. 

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



Saprophytes. Sterile hyphae creeping, fertile ascending, 

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

 gen. Helminthophora') 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 hyphao 

 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 tho 

 septa, colourless, 26-32 x 10-13 /x. 



