Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic Fungi

by M. C. Cooke

Var. c. Tussilaginis, Pers.; clusters round, on a thickened base; peridia circinating.—On the under surface of leaves of Coltsfoot and Butter-bur. Common. Autumn.

Var. d. Jacobæa, Grev.; pustular, soon becoming agglomerated, numerous, depressed; peridia splitting into short, brittle, yellowish-white teeth.—On leaves of Senecio Jacobæa and Sonchus arvensis. June to August.

Var. e. Lapsani, Purt.; spots purplish, irregular, confluent, on both sides of the leaves; peridia amphigenous, in irregular patches or scattered, not prominent, teeth numerous, minute, reflexed; spores yellow, oval.—On both surfaces of the leaves of Lapsana communis. April. Not uncommon.

Æcidium Saniculæ, Carm. Sanicle Cluster-Cups; spots purplish, slightly incrassated, small, scattered, roundish; peridia in small circulate clusters, hypogenous, and on the petioles, at first hemispherical, at length open, margin with from 4 to 6 spreading lobes; spores yellowish, elliptical.—On the under surface of the leaves and on the petioles of Sanicula Europæa. Not uncommon. May and June.

Æcidium Violæ, Schum. Violet Cluster-Cups; spots yellowish; peridia in irregular heaps, seriate and scattered; spores orange, at length brown.—On leaves, petioles, and sepals of Violets. Common. May and June.

Æcidium Poterii, Cooke. Burnet Cluster-Cups; spots obliterated, clusters subrotund or elongated; peridia hypogenous and on the petioles, circinating or scattered, immersed, margin irregularly fringed with numerous minute teeth, soon falling away; spores yellowish, oval.—On the under surface of the leaflets and on the petioles of Poterium Sanguisorba. Rare. May and June. Dartford Brent, Kent.

Æcidium Geranii, DC. Cranesbill Cluster-Cups; spots yellow and purple; peridia in circinating clusters; spores yellow, at length brown.—On the under surface of leaves of Geranium pratense and G. dissectum. Not common.

Æcidium Menthæ, DC. Mint Cluster-Cups; spots obliterated; subiculum thickened; peridia scattered, emersed, or aggregate immersed; spores orange, elliptic.—On various Mints. Common.

Æcidium Scrophulariæ, DC. Figwort Cluster-Cups; spots yellowish; peridia in roundish circinate clusters (rarely scattered) on the under surface; spores whitish, becoming tawny.—On the leaves of Scrophularia aquatica. Thame and Sydenham, Oxon.

Æcidium Pedicularis, Lobosch. Red-rattle Cluster-Cups; spots obliterated, subiculum thickened; peridia thickly and irregularly clustered, subimmersed; spores dirty, pallid orange.—On petioles, leaves, and stems of Pedicularis palustris. Not common.