Parasitic Piingi of Illinois. 41 7 



the diameter, and in specimens on Lespedeza capitata from Wis- 

 consin (Panimel), which otherwise agree with this species, the 

 appendages are five or six times the diameter. 



M. symphoricarpi, Howe. 



(Torr. Bull., V., p. 3.) 



Amphigenous. Mycelium abundant, persistent; perithecia 

 small, 80-100 n, delicate, reticulations large, regular, 15-20 /t; 

 appendages 8-16, hyaline or slightly colored at base, 2-4 times 

 as long as the diameter of the perithecium, 4-5 times dichoto- 

 mous, branches short, compact, tips truncate, somewhat swollen, 

 not recurved; asci 4-10, small, 50 |tt long; spores 4-6, small and 

 narrow, 10-18 ft^. 



Mycelium effused, sub-persistent; perithecia scattered or crowded; 

 appendages 8-14, 2-4 times the length of the diameter of the perithecia, 

 3-5 times dichotomous, ramuli divaricate, tips variable, often truncate, 

 never curved ; asci 4-6 ; spores 3-5. — Howe, Torr. Bull., V., p. 3. 



On Sympliorivarpus vulgaris: Piatt, Aug. 15, 1074, Aug. 

 16, 1099; McLean, July 29, 2372. SijmphoricarpHs sps.: Union, 

 Nov. 1, 2184. 



This is much like some forms of M. vaccinii, but the my- 

 celium is more abundant and the reticulations are larger and 

 more evident. 



M. vaccinii, C. & P. 



(Erysiphei of the U. S., in Jour, of Bot. 1872.) 



Erysiphe vaccinii, Schw. [?] (N. A. Fungi, p. 270). 



Amphigenous. Mycelium thin and delicate, often eva- 

 nescent, or sometimes abundant, peristent; perithecia variable, 

 often small, 80-90 ^u, or large, 110-120 ft, fragile; appendages 

 10-20, hyaline, smooth, slightly colored at base, 2 or 3 to as 

 many as 6 times the diameter of the perithecium, branching 

 various, usually 3 or 4 times forked, with the tips truncate or 

 bifid, not recurved, occasionally more ornate, with tip distinctly 

 recurved; asci 4-8, small and broad, about 40 by 55 m; spores 

 4-6 small. 



Amphigenous; mycelium arachnoid, evanescent; perithecia globose, 

 scattered; asci 6 to 8; spores 6 to 8; aj)pendages rather numerous (12 to 



