=Æcidium Epilobii=, DC. WILLOW-HERB CLUSTER-CUPS; spots obliterated; peridia scattered, at length oval, wider above; spores orange, at length brown.—On the under side of leaves of _Epilobium montanum_, _E. hirsutum_, and _E. palustre_, rarely on the upper. Common. June to August. =Æcidium Thesii=, Desv. BASTARD-TOADFLAX CLUSTER-CUPS; spots obliterated; peridia scattered or biseriate; short, cylindrical, margin irregularly toothed, erect; spores yellowish, then dingy.—On _Thesium humifusum_. Downs near Winchester. July, 1864. Chipstead, Surrey, Oct. 14, 1864. (Plate III. figs. 50, 51.) =Æcidium Soldanellæ=, Hornsch. SOLDANELLA CLUSTER-CUPS; spots obliterated; peridia solitary, scattered over the inferior surface; spores orange.—On the under surface of the leaves of _Soldanella alpina_. =Æcidium Tragopogonis=, Pers. GOATSBEARD CLUSTER-CUPS; spots obliterated; peridia scattered, torn, wider above; spores orange, at length black.—On stems, leaves, and involucres of common Goatsbeard. Very common. May to June. (Plate I. figs. 1-3.) =Æcidium Euphorbiæ=, Pers. SPURGE CLUSTER-CUPS; spots obliterated, leaf thickened; peridia scattered or crowded, distinct; spores orange.—On the under surface of the leaves of Spurge. Common. May to June. SECT. II. _Peridia in tufts or clusters._ α. _Elongatæ._ =Æcidium Berberidis=, Pers. BERBERRY CLUSTER-CUPS; spots roundish, bright red; subiculum thickened; peridia in subrotund or oval patches, often elongated; spores orange.—On leaves, peduncles, and fruit of the common Berberry. Common. May to July. (Plate I. figs. 7-9.) =Æcidium Thalictri=, Grev. MEADOW-RUE CLUSTER-CUPS; collected in roundish clusters; peridia oblong; spores bright orange.—On _Thalictrum alpinum_. Not uncommon in Scotland. =Æcidium crassum=, Pers. BUCKTHORN CLUSTER-CUPS; spots yellow-brown, subiculum thickened; peridia crowded into a roundish heap, at first globose, yellow, at length open; spores orange.—On _Rhamnus catharticus_ and _R. frangula_. Common. =Æcidium Periclymeni=, DC. HONEYSUCKLE CLUSTER-CUPS; spots variegated, yellow and brown, subiculum thickened; peridia sometimes elongated, in roundish or effused heaps; spores orange.—On the under surface of Honeysuckle leaves. Not common. June to August. β. _Poculiformæ._ =Æcidium Calthæ.= Grev. MARSH-MARIGOLD CLUSTER-CUPS; aggregate; peridia somewhat campanulate, with numerous minute marginal teeth; spores bright orange, subglobose or oval.—On leaves and petioles of _Caltha palustris_. Margin of peridia pale and brittle. Rare. Spring. =Æcidium Ranunculacearum=, DC. CROWFOOT CLUSTER-CUPS; spots obliterated, subiculum thickened; peridia in irregular heaps, densely crowded together; spores orange.—On leaves of various _Ranunculaceæ_; very common on _R. Ficaria_, not uncommon on _R. repens_, more rarely on _R. acris_ and _R. bulbosus_. Spring. (Plate II. figs. 12-14.)