20 i MICROSCOPIC FUNGI. 



Ustilago vinosa, Tiil. Oxyeia Smut; produced on tlie 

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

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

 receptacles of Oxyria reniformis. Uncommon, 



Ustilago utriciilosa, Tul. Uteicle Smut ; produced in 

 the gernien and perigonium ; epidermis soon ruptured ; spores 

 effuse, minute, globose, purple-black.— On Folygonum hydropiper 

 and other Polygona. Autumn. Not uncommon. (Plate VI. 

 figs. 112—116.) 



Ustilago flosculoruin, Pr. Eloret Smut; produced 

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

 Covets of Scabiosa arvensis. Not common. (Plate YI. figs. 123 — 

 125.) 



Ustilago receptaeulorum, Fr, 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, Julv. Common. 

 {Plate V. figs. 92—95.) 



Ustilago antheraruin, Pr. Anther Smut; produced 

 on the anthers and ffermens; spores subglobose, effuse, violet. 

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



Uredo, Lev. 



Stroma composed of little irregular cells forming a lentifonn 

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

 each of which encloses a spore ; spores simple, always 

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



* Spores more or less yellow. 



Uredo Potentillarum, DC. Pote^-tilla Uredo; spots 

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

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

 Rosaceoe. Common. 



Uredo Saxifragarum, DC. Saxifrage Uredo ; 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 yeUowisli ; sori 

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

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

 Ferns {Cystopteris, &c.) Not common, 



Uredo pust"iilata,P. "Willow-herb Uredo; spots yellowish ; 

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

 surfaces ; spores globose, yellow. — On J^pilolAum palustre. 



