24 



M. diffusa, C. & P. Erysiphei of U. S. in Journ. of Bot. 1872, 25th 

 Rep. N. Y. State Mus. p. 95. 



Usually epiphyllous. Perithecia scattered, 90-120 ft, dark, 

 opake, reticulations rather obscure, 10-15 ft, 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 4-7, ovate, pedicellate, rather small, 30- 

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



On Desm odium canescens, D. cuspidatum, D . paniculatum, D . 

 Canadense, I). sessilifolium, Lespedeza, violacea, L. kirta, L. capi- 

 tata, 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 

 though variable is well characterized by the elongated branches of the 

 appendages. 



M. Grossul arise, (Wallr.) 



Alphitomorpha penicillata var. Grossularice, Wallr. Verh. Naturf. Freundel, p. 40, 

 Microsphcera Grossularice, I v ev. 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 ft, reticulations about 15 fi) 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 

 4-6, variable, 15-30 ft long. 



On JRibes rotundifolium, R.floridum and R. nigrum, Sambucus 

 Canadensis and S. racemosa. 



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

 The branched tips of the appendages are very characteristic, though 

 the branchlets vary considerably in length. 



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



Amphigenous. Mycelium abundant, persistent. Perithecia small, 

 80-100 /i, delicate, reticulations large, regular, 15-20 /i; 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 4-10, 

 small, 50 ft long. Sporidia 4-6, small and narrow, 10-18 p.. 



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

 Common across the continent. 



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



