MiCROSFHAERA 129 



definite, and unlike that found in Erysiphe, and the proper position 

 of the present plant is certainly in Microsphacra, to one species of 

 which — /]/. Bdiniilcri — it shows a close relationship. 



M. astragali is confined to Europe ; the plants referred to this 

 species from North America all belong (as far as I have seen) to 

 M, eupjiorbiae. This is the case with the specimen " J/ holosen- 

 cea Lev., on leaves of Astragalus Coopcri, Buffalo, N. Y. (C. H. 

 Peck, n. 1 98)," recorded by Cooke and Peck in the Journal of 

 Botany (91), and mentioned in Saccardo*s Sylloge, i; 12; also 

 with the specimen named '' M. Jiolosericea'' on an unnamed host- 

 plant (probably ^^Yr^^^///^ Druuunondii), n. 1572, Flora of Col- 

 orado, Colorado Springs (5500 ft.), 1879 (M. E. Jones); and with 

 other examples. 



Massalongo (237, p. 127) has recorded '' M. astragali ^ 

 cytisi '' on ''Cytisiis alpinus (vel C. Laburnum)y Specimens (now 

 ■in the Kew Herbarium) kindly sent to me by this author prove to 

 belong: to M, Guarinouii, 



fci 



Winter records M. astragali on Astragalus virgatus, but the 

 fungus so-named on this host in the Exsiccati quoted by this 

 author (de Thuem. Fung, austr. 1237) is Erysip he polygon i. 



4. M, ALXi (Wallr.). [Figs. I -14] 



AlpJiitojnorpha penicillata^ var. alni Wallr- Berl. Ges. Nat. 

 Freund. Verh. i : 40 (syn. excl.). 18 19. 



A. rt://// Wallr. Ann. Wett. Ges. 4: 237 (syn. excl.). 1819. 



A. penicillata^ var. rhanini cathartici Schlecht. Bcrl. Ges. Nat. 

 Freund. Verh. i : 49. 18 19. 



Erysibe penicillata Lk. ; Wilid. Sp. PI. 6: 113 (excl. vars. 

 ^rossulariae ^xxdberberidis, and syn. E\alni DC). 1824 ; Rabenh. 



1829; 



Deutschl. Krypt. Fl. i : 236 (partim). 1S44. 



Erysiph 

 Duby, Hot. Gail. 2: 871 (partim). 1830; Berk.; Sm. Engl. Fl. 



5 : 327 (partim). 1836. 



E. vibunii Duby, Bot. Gall. 2 : %72. 1830. 



Alphitomorpha penicillata W^Wr, Fi. Crypt. Germ. 2 : 754 (par- 

 tim). 1833. 



Erysiphc densissinia Schw^ein. Syn. Fung. Am. Bor. 269. 1834. 



