756 PHACIDIACEI. 



SJr.n.p.6GH. Grev.tAlS,f.2. Mem. Mus. in. t. SJ. 5. Nees. 

 f. 20. Pers. Disp. t. 2, f. 4. Schm. exs. no. 37. Moug. exs. no. 175. 

 Eng. PL y. p. 200. ful. Carp. W'l.p. UO,t.\hJ. n-22- PcJcl. 

 exs.7w.lOSi, 1085. Berk. exs. 7io. 4:3. 



On willow leaves. Common. [Low. Carolina.] 



The plant doos not appear with an open disc until the spring, the dead 

 leaves having laid on the ground through the winter, when, as in the next 

 species, the fruit is matured ; sporidia '1 m.m. long i^W- 357.) 



2279. Rhytisma aceirinum. Fr. " Maple Rhytisma." 



Spermogonia. — Epiphyllous, scattered or confluent, forming 

 black, suborbicular pustular spots, encircled with a discoloured 

 zone ; spermatia cylindrical, linear, hyaline, straight or curved, 

 •0065 m.m. long. — Melasmia acerina, Lev. Ann. Sc. Nat. 1846, 

 p. 276. B. 4' Br. Ann. N.H. no. 443. 



AscoPHORE. — Innate, spots irregular, confluent, rugose, burst- 

 ing by flexuose labiate fissures ; disc growing pale ; asci obovate- 

 lanceolate ; sporidia filiform-lanceolate, flexuose. — Fr. S.M. ii. 

 j>. 569. Bull. t. 504,/. 13. Berk. exs. no. 194. Cooke exs. no. 181. 

 Nees.f. 21. Mem. Mus. iii. t. 3,/. 9. Grev. 1. 118,/. 1. Schm. exs. 

 no. 105. Moug. exs. no. 77. Eng. Fl. v. p. 290. Tul. Carp. iii. p. 

 117, t. XV. f. 9-12. Fckl. exs. no. 1082. 



On sycamore and maple leaves. Common. [United States.] 

 Sporidia "08 m.m. long. 



2280. Rhytisma punctatum. Pr. " Punctate Ehytisma." 



Innate, crowded, angular or roundish, rugose, shining black, 

 bursting in little fragments, internally brownish-black ; sporidia 

 linear, the length of the ascus, hyaline. — Fr. S.M. ii. jj. 669. 

 Mem. Mus. iii. t. 8,f. 4. Fng. Fl. y.j). 291. Moug. exs. no. 477. 



On sycamore leaves. [Mid. Carolina.] 



It is doubtful whether this is really distinct from the foregoing. I think 

 not, but never having met with perfect fruit it is inserted. 



2281. Rhytisma uzticae. Fr. " Nettle Rhytisma." 



Innate, cohering in an elongated, ambient crust, tubercles 

 slightly prominent, even, bursting by a slightly flexuous fissure ; 

 sporidia filiform, the length of the ascus. — Fr. S.M. ii.p. 570. 

 Fng. Fl. Y.p 291. Fries, exs. no. 209. Moiig. exs. no. 865. Fckl. 

 exs.no. 1089. Cookeexs.no. 392. 



On nettle stems. Winter and spring. 



