1885.] 



RAMULARIA OBOVATA. 



69 



ON RAMULARIA OBOVATA, FCKL., 



Sym. Mycol. p. 103. 



BY J. B. ELLIS AND BENJAMIN M. EVERHART. 



The specimens of this species distributed in the North American 

 Fungi afford the following characters : 



Spots orbicular, 2—8 mm., reddish brown with a dirty white center 

 and a darker colored, narrow, sometimes slightly raised border, around 

 which the leaf is at first purplish. Hyphse amphigenous but mostly 

 hypophyllous fasciculate, hyaline, continuous, very rarely with 1—2 septa, 

 nearly straight, but often undulate, subdenticulate above, 70—125 x 3-^>". 

 Conidia terminal, obovate, granular, without septa, 18—25 x 8—11 



Specimens of E. obovata, Fckl. in Rabh. Winters' Fungi Europsei, 

 agree well with the above description, but specimens collected on Bumex 

 crispus, in Ohio, by Dr. W. A. Kellerman, June, 1883, and which at the 

 time were referred to this species, differ in several particulars. The 

 spots are larger and of a dirty gray color, without any white center. 

 The hyphse are shorter (40—60 ,'->■) and not undulate, and the conidia vary 

 from oblong-clavate to cylindrical, and are, as a rule, uniseptate, occa- 

 sionally 2—3 septate. Cylindrical is the prevailing form, slightly con- 

 stricted at the septum, agreeing, in fact, very well with those of speci- 

 mens on Bumex collected at Wood's HoU, Mass., by Dr. W. G. Farlow, 

 and mentioned by him in Bulletin of the Bussey Inst., 1877, pp. 236 and 

 237, and in Proc. Am. Acad. 1878, p. 262, as probably referable to Bamula- 

 ria ohovata, Fckl., or B. macrospom^ Fres., of which the first mentioned 

 species is there regarded as a probable synonym. In preparing the list 

 of Bamulanas, we have found among our European specimens only one 

 fruitful specimen of jB. obovata^ Fckl., viz., the one in Fung. Eur. already 

 referred to. The specimen in Mycotheca Marchica, no. 493, afforded us 

 neither hyphse nor conidia, and on two specimens from Von Thuemen we 

 could find no conidia. We find, however, in Hedwigia, June, 1883, a 

 paper by Professor C. A. J. A. Oudemans on the ''Identity of Oidium 

 monosporium.West.^ PeronosporaoUiqua, Cke., and Bamularia obovata, 

 Fckl.," in which the Professor states that he has examined specimens of 

 B. obavata, Fckl., distributed under different names in various European 

 collections, viz., Fckl.'s Fungi, Rhenani, Cooke's British Fungi and Sac- 

 cardo's Mycotheca Yeneta, and finds them all agreeing with the descrip- 

 tion given by Fuckel of his Bamularia obovata, the obovate 20—25 x 10— 

 12 !■>■ conidia being constantly without septa and borne on generally sim- 

 ple and continuous undulate hyphae. Prof. Oudemans also states that he 

 examined fresh, living specimens and found them all to agree with the 

 dried specimens and with the description of the species in question given 

 by Fuckel. The constant invariability of the European specimens would 



