JOURNAL OF MYCOLOGY. 



Vol. L MANHATTAN, KANSAS, JUNE, 1885. No. 6. 



NORTH AMERICAN SPECIES OF RAMULARIA. 



WITH DESCEIPTIOisS OF THE SPECIES. 



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



Ramularia, closely allied to Gercospora, and having the same gen- 

 eral characters and mode of growth as that genus, is distinguished by its 

 hyaline (colorless) hyphse and conidia. The conidia (spores) are also 

 often concatenate, i. e. produced in series or chains, one above the other, 

 and attached to each other by their contiguous ends. They also vary 

 considerably in shape, from nearly globose to ovoid, oblong or cylindrical, 

 but are not prolonged or attenuated above as is usual in Cercospora. 

 This, in fact, is the only character separating them from the Cercosporas 

 with hyaline hyphse (OercosporeZZa, Sacc.) The Bamularias with globose 

 or ovoid conidia, are separated by Saccardo under the name Ovularia, 

 but we ha^j^ here included them all under Bamulaiia. The species are 

 all biogenous, i. e. growing on living plants, mostly on the leaves, often 

 on definite spots on the leaves. The mycelium spreading through the 

 intercellular spaces of the leaf, sends out through the stomata,the fertile 

 hyphse at the extremities of which the conidia are produced. Conidia 

 also, or oftener the scars that marH the place of their attachment after 

 the conidia themselves have fallen, are seen along the sides of the fertile 

 hyphse, but this generally aris,es from the fact that the growth of the 

 hypha is not arrested with the formation of the first terminal spore, but 

 pushes its apex obliquely by the spore which thus becomes lateral, 

 another terminal spore being formed above the first and generally on the 

 opposite side of the hypha, and this process may be several times 

 repeated, the hypha becoming thus abruptly bent this way and that 



