APPENDIX. 215 



CCEOMACEI. 



Cromaetium, Tul. 



Stylospores ellipsoid, stem slender ; pseudoperidium in the form 

 of an elongated cylindrical tube, opening by a pore at the 

 apex ; pseudo-spores oblong, truncate. 



CroDartium PsBonise, Cast. ; Uredo- spots obsolete ; sori 

 yellowish; stylospores oval e-globose ; peridia short, erect, obtuse, 

 seated on a black tubercle.— On Pseony leaves. 



Uredo, Lev. 



Strowfi composed of little irregular 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. Outl., 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 

 Rosaceae. Common. 



Uredo Saxifragarum, DC. Saxifrage Uredo; spots 

 pallid ; sori subiotund and oval, raised, scattered and aggregate 

 on the under surface ; epidermis ruptured, persistent ; spores 

 subglobose, yellow. — On various Saxifrages. Said to be the 

 conidia of Puccinia Saxifragarum, 



Uredo Filicum, Desm. Fern Uredo ; spots yellowish ; 

 sori suhrotund, bullate, scattered and aggregate on the under 

 surface ; epidermis at length bursting; spores subglobose, yellow. 

 — On Ferns {Cystopteris , &c.) Not common. 



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

 lowish ; SO' 1 subrotund, minute, closed, scatterert and confluent 

 on both surfaces; spores globose, yellow.— On Epilobiim palustre. 



Uredo Hypericorum, DC. St. John's Wort Uredo ; 

 spots yellowish; sori subrotund, small, bullate, distinct, scattered 

 on the under surface ; epidermis at length bursting ; spores sub- 

 globose, cohering, orange.— On varions Hyperica. August. Not 

 uncommon. (Plate Vlll. figs. 174, 175.) 



