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210 MICEOSCOPIC FUNGI.
Trichobasis suaveolens, Lev. Thistle Rust; spots
obliterated, yellow on the opposite side; sori subrotund, nearly
plane, scattered, at leng^th confluent, on the under surface, surrounded
by the ruptured epidermis ; spores globose, brown.—On
leaves of Thistles, frequently covering the wliole under surface.
Summer. Common. (Plate VII. figs. 151— 153.)
Trichobasis Polygonorum, B. Knotgrass Rust ; spots
red-yellow, widely effused; sori subrotuud, scattered, sometimes
forming a ring, epidermis at length bursting ; spores somewhat
obovate, brown.— On Polygonum, avieulare, amphibium^ and other
species. July to September. Common.
Trichobasis Vincse, B. Periwinkle Rust ; spots yellowish;
sori small, subrotund, and oval, on the under surface, surrounded
by the ruptured epidermis ; spores oval, rather ovoid,
brown.— On leaves of Finca major. May and June. (Plate YI.
fig. 130, 131.)
Trichobasis Geranii, B. Geranium Rust ; spots yellowish
sori ; subrotund, nearly plane, scattered or confluent ; spores
subglobose, brown.— On various species of Geranium.
Trichobasis ViolarunijB. YioletRust ; spots yellowish ;
sori subrotund, scattered, generally on the under surface ; epidermis
ruptured, persistent; spores subglobose, brown.— On leaves
and petioles of Violets. July. Kot uncommon.
Trichobasis Parnassise, Cooke. Grass of Parnassus
Rust ;
on both surfaces of the leaves ;
sori at first bullate, at
length rupturing the epidermis, scattered, often confluent ; spores
globose or nearly so, rather large, tawny brown.— On Farnassia
pahistris. Irstead, Norfolk. September, 1864.
Trichobasis Epilobii, Berk. Willow-herb Rust ; spots
yellowish sori
; subrotund, scattered, surrounded by the ruptured
epidermis, often on the under surface ;
— On Epilobium montanum, &c. June and July.
spores subglobose, brown.
Trichobasis Rhamni, Cooke. Buckthorn Rust ;
seated
on definite yellowish spots ;
sori occurring only on the under
surface of the leaves, scattered or collected in clusters, very
minute, roundish, or oblong ; spores at length rusty brown, subglobose.—On
Rhamnus catharticus. Selsdon, Surrey. September
16, 1864. {A. Grugeon)
Uromyces, Lh.
Spores unilocular, attached permanently to a decided peduncle
of greater or less length.— j5^r/t. Otdl.t p. 333.