24 



M. diffiisa, (\ & P. Erysiphei of V. S. in Journ. of Bot. 1872, 25th 

 Rep. N. Y. State Mus. p. ( ->5. 



Usually epipliyllous. Perithecia scattered, 1)0-] 20 p, dark, 

 <>pake, reticulations rather obscure, 10-15 /A appendages 15-25, hya- 

 line, or slightly tinted at the base, 2-4 or more times as long as the 

 diameter of the perithecium, 1 to 4 or 5 times irregularly or dichoto- 

 mously branched, branches long and diffusely spreading, not at all 

 swollen or recurved. Asci 47, ovate, pedicellate, rather small, 30- 

 35 x 60-65 p. Sporidia 4-8, mostly 4-5. 



On Desmodium canescens, D. cuspidatum, D . paniculatum, D . 

 C ana dense, D. sessilifolium, Lespedeza, violacea, L. hirta, L. capi- 

 tf/ta, Lathyrus ochroleucus, Vicia, and Phaseolus perennis. 



Reported from the eastern seacoast to Minnesota (Seymour) and 

 .Missouri (Tracy and Galloway). It is abundant and frequent, and 

 thono'h variable is well characterized bv the elongated branches of the 



*/ O 



appendages. 



M. Grossnlariie, (Wallr.) 



Alphitomorpha penicillata var. Grossulance, Wallr. Verb. Naturf. Freundel, p. 40, 

 Microsphcera Grossularits, Lev. Ann. Sci. Nat. Ser. Ill, T. XV, p. 160. 

 Microsphcera Van-Bruntiana, Ger. Bull. Torr. Bot. Club. VI, p. 31. 



Amphigenous. Mycelium thin or rather dense, white, persistent. 

 Perithecia scattered, 75-1 20 u., reticulations about 15 //; appendages 

 10-20, once to twice as long as the diameter of the perithecium, hya- 

 line or tinted at the base, very conspicuously 4-6 times dichotomously 

 forked, with straight, obtuse digitate branchlets. Asci 3-5. Sporidia 

 46, variable, 15-30 /j. long. 



On Ribes rotundifolium, R.floridum and H. nigrum, Sambucus 

 Canadensis and S. racernosa. 



Not very uncommon from the Atlantic to Montana (Anderson). 

 The branched tips of the appendages are very characteristic, though 

 the branchlets varv considerably in lensrth. 



/ / o 



M. Symphoricarpi, Howe, Bull. Torr. Bot. Club. V, p. 3. 



Amphigenous. Mycelium abundant, persistent. Perithecia small, 

 80-100 //, delicate, reticulations large, regular, 15-20 //; appendages 

 8_16 ; hyaline or slightly colored at base, 2-4 times as long as the 

 diameter of the perithecium, 4-5 times dichotomous. branches short, 

 compact, tips truncate, somewhat swollen, not recurved. Asci 410, 

 small, 50 ti long. Sporidia 4-6, small and narrow, 10-18 //.. 



On Symphoricarpus vulgaris, S. occidentalis and S. racemosus. 

 Common across the continent. 



Much like some forms of M. Vaccinii, but the mycelium is more 



