SPH^EOXEilEI. 441 



1296. Piggotia astroidea. B.&Br. " Stellate Piggotia." 



Epiphyllous, black, perithecia slightly prominent, connate, 

 forming small irregularly stellato-aggregate tubercles ; spores 

 broadly ovate, sporophores short, tomiparous. — B. ^ Br. Ann. 

 N.H. no. 503, t. 5,/. 3. Dothidea astroidea, Eng. Fl. y. p. 287. 

 Asteroma uhni, Grev. Fl. Ed. p. 368. 



On green leaves of elm. 



Jet black, forming irregular, roundish, granulated, or wrinkled patches on 

 the upper surface of the leaf, sometimes seated on a yellow spot, but fre- 

 quently without any discoloured border ; perithecia sub-orbicular where 

 solitary, but soon confluent, though not making a uniform stratum, obsolete 

 below, thin and shining above, bursting irregularly by a jagged orifice ; 

 spores oozing from the ruptures, and forming roundish discs, which at first 

 look like the hymenium of some Peziza, broadly ovate, slightly constricted 

 towards the obtuse base ; sporophores short, at length tomiparous. — B.d-Br. 



{Fig. 165.) 



Gen. 122. SEPTORIA, Fries. 



Perithecia minute, more or 

 less incorporated with the 

 matrix ; spores oblong and 

 septate, or thread-shaped, and 

 continuous, discharged in little 

 tendrils. — BerJc. Outl.p.Sld, 

 (Fig. 166.) 

 This is a very large and doubtful genus, but is retained here provisionally. 



1297. Septoria ulmi. Xze. " Elm Septoria." 



Spots brown, perithecia small, scattered ; cirrhi dirty-white ; 

 spores nearly straight, subquadriseptate. — Kunze M.H. ii.^. 107. 

 Grev. 1. 112. Eng. Fl. Y.p. 356. Cooke, exs. no. 201 . Fchl. exs. no. 

 506. Corda. Anl. t. F.f. 54, no. 10, 11. Berh. exs. no. 214. Cooke, 

 L.F. no. 63. 



On elm leaves. Common. [United States.] 



(Fig. 166.) 



1298. Septoria heraclei. FcTd. " Hog-weed Septoria." 



Epiphyllous; spots none ; perithecia somewhat solitary, in- 

 nate, brown, pierced ; tendrils white ; spores long, fusiform, — 

 Fckl. exs. no, 515. Ascoxyta heraclei. Lib. exs. no. 51. 



On fading leaves of Heracleum. 



The spores are large, and very profuse, lying in white patches upon the 

 leaves after they are expelled from the perithecia. Allied closely to S. ulmi. 



Fig. 166. 



