BULLETIN OF THE BUSSEY INSTITUTION. 429 
CYSTOPUS. 
Conidia in rows, packed closely together, and bursting through the 
epidermis in spots. Odspores as in Peronospora. 
Cysrorus cANnpiIDUs (Pers.), Uredo Auct. (White-Cabbage Mould). 
Conidia of uniform size, round. Odspores large, round, yellowish, 
marked with flexuous ridges, sometimes reduced to rough papille. 
Common on cruciferous plants, Atlantic and Central States. On 
Capsella bursa pastoris, Dentaria epiphylla, Sinapis nigra (odspores), 
Turritis, &e. 
Cystopus Buir1, Bivon, C. Portulacee (D. C.), De Bary, 1. ce. 
Nos. 3 and 4. Conidia of two kinds, — the terminal larger than the 
rest, and generally sterile; the rest cylindrical ovoid. Odspores 
_ large, round. Epispore dark-brown, marked with slightly elevated 
ridges, which, at maturity, form a net-work. Common on different 
species of Amaranthus and on Portulaca oleracea. 
Cysropus cupicus, Mart., Uredo candida, var. Auct. Berkeley, 
Not. N. A. Fungi, Grevillea, Dec., 1874. Conidia of two kinds, — 
terminal large and sterile; the rest short, cylindrical. Odspores round, 
dark-colored, densely covered with small protuberances. On Convol- 
vulus panduratus, Ipomea trichocarpa. On Convolvulus macrorhiza, 
Ohio (vid. Berkeley 1. ¢.). On Ambrosia artemisiefolia, Newton, 
August, 1874. We should be thankful that there is one fungus, at 
least, which is injurious to this troublesome weed. 
CysTOPpuUs sPINULOSUs, De Bary, has been detected by Peck on 
Cirsium, collected by Hon. G. W. Clinton, near Buffalo, N. Y. 
