=Trichobasis Hydrocotyles=, Cooke. FLUKEWORT RUST; without definite spots; sori chiefly on the upper, sometimes on the under surface, scattered, variable, roundish, erumpent, surrounded by the ruptured epidermis; spores subglobose, at length brown; epispore rough with minute tubercles.—On _Hydrocotyle vulgaris_. Epping, July to September, 1863 and 1864. (Plate VIII. figs. 168, 169.) =Trichobasis Betæ=, Lév. BEET-LEAF RUST; spots yellow; heaps subrotund and oval, scattered and concentric, on the upper surface; epidermis at length bursting; spores subglobose, shortly pedicellate, brown.—On the leaves of Beet. August and September. Common. =Trichobasis Fabæ=, Lév. BEAN RUST; spots obliterated; sori subrotund and oval; bullate, scattered and aggregate, surrounded by the ruptured epidermis; spores ovoid, brown.—On Beans. August and September. Common. =Trichobasis Galii=, Lév. BEDSTRAW RUST; spots yellowish; sori subrotund, aggregate, closed; spores globose, reddish.—On _Galium verum_, _saxatile_, &c. July and August. =Trichobasis suaveolens=, Lév. THISTLE RUST; spots obliterated, yellow on the opposite side; sori subrotund, nearly plane, scattered, at length confluent, on the under surface, surrounded by the ruptured epidermis; spores globose, brown.—On leaves of Thistles, frequently covering the whole under surface. Summer. Common. (Plate VII. figs. 151-153.) =Trichobasis Polygonorum=, B. KNOTGRASS RUST; spots red-yellow, widely effused; sori subrotund, scattered, sometimes forming a ring, epidermis at length bursting; spores somewhat obovate, brown.—On _Polygonum aviculare_, _amphibium_, and other species. July to September. Common. =Trichobasis Vincæ=, 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 _Vinca major_. May and June. (Plate VI. 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 Violarum=, B. VIOLET RUST; spots yellowish; sori subrotund, scattered, generally on the under surface; epidermis ruptured, persistent; spores subglobose, brown.—On leaves and petioles of Violets. July. Not uncommon. =Trichobasis Parnassiæ=, 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 _Parnassia palustris_. 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; spores subglobose, brown.—On _Epilobium montanum_, &c. June and July.