204 MICROSCOPIC FUNGI. 



Ustilago vinosa, Tul. Oxyeia Smut ; produced on the 

 swollen receptacles ; spores^ roundish, very small, and minutely 

 papillose, separately pellucid, in clusters, violaceous. — On the 

 receptacles of Oxyria reniformis. Uncommon. 



Ustilago utriculosa, Tul. Utricle Smut; produced in 

 the germen and perigonium ; epidermis soon ruptured ; spores 

 effuse, minute, globose, purple-bJack. — On Polygonum hydropiper 

 and other Folygona, Autumn. Not uncommon. (Plate Yl. 

 figs. 112—116.) 



Ustilago flosculorum, Tr. Tloret Smut; produced 

 within the florets ; spores minute, purplish-brown. — On the 

 florets of Scabiosa arvensis. Not common. (Plate YL figs. 123 — 

 125.) 



Ustilago reoeptaculorum, Pr. Goatsbeard Smut; 

 produced within the receptacles ; spores ovate, minute, reticu- 

 lated, violet-brown, nearly black, very profuse, filling the recep- 

 tacle. — On the receptacles of Goatsbeard. June, July. Common. 

 (Plate Y. figs. 92-95.) 



Ustilago antheraniin, Pr. Anthek Smut; produced 

 on the anthers and germens; spores subglobose, efPuse, violet. 

 —On the anthers of Silene wjiata, &c. (Plate Y. figs. 102 — 104.) 



Ueedo, Lev, 



Stroma composed of little n-regular cells forming a lentiform 

 disk, whose surface is covered with many layers of cells, 

 each of which encloses a spore ; spores simple, always 

 without any appendage. — Berk. Oiitl., p. 331. 



^ * Spores more or less yellow. 



Uredo Potentillarum, DC. Potentilla Uredo; spots 

 yellowish ; sori subrotund and oval, bullate, aggregate, open, 

 confluent ; spores subglobose, subcoherent, orange. — On various 

 Rosacea. Common. 



Uredo Saxifragarum, DC. Saxifrage Ueedo ; spots 

 pallid ; sori subrotund and^ oval,^ raised, scattered and aggregate 

 on the under surface ; epidermis ruptured, persistent ; spores 

 subglobose, yellow. — On various Saxifrages. 



Uredo Filicum, Desm. Pern Uredo ; spots yellowish ; sori 

 subrotund, bullate, scattered and aggregate on the under surface ; 

 epidermis at length bursting; spores subglobose, yellow. — On 

 lerns {CystopAeris, &c.) Not common. 



Uredo pustulata,P. Willow-herb Uredo; spots yellowish; 

 sori subrotund, minute, closed, scattered and confluent on botli 

 surfaces ; spores globose, yeUow.— On Epilobium palustre. j 



