414 



ridia ovoid-oblong, continuous, subhyaline. The genus has the habit 

 of PhyUachora or Rhytisma. 



T. quercina, (Fr. & Rud.) (Plate 31) 



Rhytismaquerctnu.nl, Fr. & Rud. in Linn. Trans. 1830, p. 551. 

 Asteroma parntelioides, Desm. PI. Crypt. Ed. I, 1737. 

 Rhytisma riccioides, Letellier Champ. V, tab. 629, fig. 4. 

 Sphceropsis riccioides, Lev. Ann. Sci. Nat. III. Ser. toni. p. 257. 

 Trabutia quercina, Sacc. & Roum. 1. c. 

 Exsicc. Thum. M. U. 2271. Ell. N. A. F. 1288. 



Pcrithecia hemispherical, subcarbonaceous, shining-black, with a 

 minute, round, perforated ostioluin, finall} 7 collapsing and umbilicate or 

 supplicate, but never opening as in Rhytisimi. Asci cylindric-clavate, 

 ] 00-1 10 x 18-21 //, paraph vsate, membrane entire at the apex, short- 

 -tipitate, soon disappearing. Sporidia biseriate, oblong-navicnlar, ends 

 siil.ol.tuse, 28-30x8-10;;. 



On leaves of Quercus laurifolia and Q. sirens, Florida and 

 Mississippi. 



T. tosta, (B. & C.) 



Rhytisma tostitm. B. & C. Cifev. IV, p. 9. 

 Ti-abntia tosta, Cke. Syn. 1372. 



"Seated on yellow spots, thin, gyrose. only here and there pro- 

 ducing fruit-bearing perithecia which soon shell off. Undoubtedly 

 distinct, but the specimens are imperfect." 



On leaves of Quercux latu'ifoliu. Alabama. 



T. evythrospora, (B. & C.) 



Rhytisma erytlunspoi inn, B. & C. Proc. Am. Acad. IV, p. izS. and Grev. IV, p. o, 

 Trabutia e.rythrospora, Cke. Syn. 1371. 



.Minute, opening with two or three laciniae. Asci swollen. Spo- 

 ridia su I .fusiform, salmon-colored, apiculate at each end, 33 // long. 

 On leaves of Quc /</( /v'/^y/.s. California. 

 The manner of dchiscence indicates Rhyti&ma* 



THYRIDIUM, Sacc. 



Mich. I, p. 50. 



Perithecia scattered or gregarious, immersed in the more or les.- 

 altercil substance of the wood or bark, and covered above by a prom- 

 inent, black, s'tromatic shield. Ostiola papilliform. S|)(>ridia subellip- 

 tical. brown or hyaline, muriform, 



Th. lividum, (Pers.) 



Sphczria livida, Per.s. Syn. p. Sr.. 

 Teichospoia limda, Karst. Myc. Feun. II, p. 68'. 

 I ',!! estella] ? livida. Winter Die Pilze No. 4251. 

 Thyridiintf liridtun, Sacc. Syll. 3991, Cke. Syu. ^i. 



