717 



L. Rhododendri, (Schw.) 



Hysterium Rhododendri, Schw. Syn. X. Am. 2116, not Lophodei mium Rhododendri, 



Ces. iu Erb. Critt. Ital. No. 537, Rehm in Die Pilze, Disc. p. 40. 

 Kxsicc. EH. N. A. F. 1287. 



Epiphyllous, on round, pale spots 1-2 cm. diam., with a reddish, 

 swollen margin both above and below, punctiforni at first, then or- 

 bicular, subdiscoid. depressed. J-j mm. diam., becoming elliptical. 

 1-lJxJ-l mm., with the opposite sides slanting up towards each 

 other and separated by a very narrow cleft. A-ci clavate. 110-1 30 x 

 12-15 p.. 8-spored. with filiform paraphyses broadly recurved at the 

 tips. Sporidia linear-cylindrical, nucleate, continuous, hyaline, 60-75 x 



9 9 1 // 



~ ~z ! 



On leaves of Rhododendron, Bethlehem, Pa. (Schw.), Mauch 

 Chunk, Pa. (Martindale), on leaves of Rhododendron Californicum, 

 Oregon (Carpenter), New York (Pecki. 



On the Oregon specimen is also another fungus agreeing accu- 

 rately with Phacidium dentatum, K/e. A; Sch.. but which can not be 

 conjured into anything like the Phacidium Rhododendri, Schw. The 

 diagnosis of this last mentioned species does not differ essentially from 

 that of Hystet'i n in Rhododendri. Schw.. both being said to he 2 lines 

 lonir and sometimes, at least, trifariouslv dehiscent: and as Schweinitz 



*.- . 



himself says he fears the two species may not be distinct, there is 

 some reason to suppose that he has given two hybrid diagnoses, each 

 combining the characters of Phacidium fmd Hysterium. The diag- 

 nosis given above is from the specc. collected by Mr. Martindale. 

 None of these now accessible show any perithecia 2 lines (4 mm.) long. 

 There can be no doubt that these specc. are a Lophodermium and 

 not a Phacidium (Coccomyces . 



L. orbiculare, (Ehrenb.) 



Hysterium orbiculare, Ehretib. F. Champ. No. 30, t. xx, fig. 15. 



Spots amphigenous, dull white above, with a narrow, reddish 

 border, 2-4 mm. diam.. becoming ferruginous below. Perithecia 

 hypophyllous. innate-erumpent, small, J J mm., sphaeroid. more or 

 less flattened and depressed above, becoming hemispherical or sub- 

 elongated with a distinct cleft across the summit, at length more or 



O ' O 



less open. Asci clavate, obtusely pointed above, 70-75x7-8 //. 

 8-spored, with abundant paraphyses curved and thickened above. 

 Sporidia clavate-cylindrical, yellowish-hyaline, multinucleate, 60-70 x 

 1J-2 p. 



On leaves of Andromeda calyculata, London. Canada (Dearness). 



In the original diagnosis the fungus is said to be epiphyllous, but 

 this may be in contradistinction to epicauline. The specc. from Dear- 



