APPENDIX. 213 



Coleosporium. Petasitis, Ler. Butterbur Kust ; on 

 the under surface, minute, depressed, spreading, somewhat ag- 

 gregate, sub-confluent, irregular in form ; spores oval, orauge, 

 or orange-red. — On Tussilago Fetasites. Autumn. Common. 



Coleosporiura Campanulse, Lev. Campanula. E>ust; 

 spots obliterated, brown on the opposite side, sori irregular, con- 

 fluent, plane, on the under surface ; spores subglobose, cohering, 

 yellow, at length pale. On leaves of various Campanulse. Sep- 

 tember and October. 



Coleosporium SoncM-arvensis, Lev. Sow-thistle 

 Rust ; on the under surface, depressed, irregular in form, scat- 

 tered, partially confluent; spores ovate, reddish orange. — On 

 Sonchns oleracens and arvensis. Summer. Common. (Plate 

 Vm. figs. 178, 179.) 



Coleosporium Rhinanthacearum, Lev. Cotv-wheat 

 Rust ; spots none or subferruginous; sori irregular, confluent, on 

 the under, rarely on both surfaces ; spores subglobosc, compact, 

 golden-yellow. — On Euphrasia officinalis, Bartsia odontites, 

 Melampyrum arvense, &c. August and September. Common. 

 (Plate VIII. figs. 176, 177.) 



Melampsora, Cast. 



Spores of two orders, crowded into a dense compact mass, with 

 or without a covering, wedge-shaped. Berk. Oiitl.y p. 33o. 



Melampsora Euphorbise, Cast. Hyp9phylIous ; sori of 

 summer spores golden-yellow, scattered, distinct, sometimes 

 cauline; spores small, subglobose ; sori of perfect spores becom- 

 ing black, small, roundish, spores prismatic, membrane thickened 

 above, dark brown.— On leaves and stems of Euphorbia helio- 

 scopia, E. exigua, and other species of spurge. Commou. (Plate 

 IX. figs. 193, 194.) 



Melampsora Populina, Lev. Hypophyllous, epiphyllous, 

 or amphigenous, at first yeUow or orange; summer spores 

 obovate-oblong, attenuated or truncate, echinulate ; paraphyses 

 obovate, capitate or claviform, abundant in fully-ripened sori; 

 sori of perfect spores at first tawny yellow, becoming black 

 during the winter, swelling in the spring, and becoming of a 

 cinnamon-colour, hypophyllous, roundish, or oblong; spores 

 prism-shaped, 5— G together, yellowish, smooth.— On leaves of 

 Populus nigra. Common. Spores perfected in I'ebruary. (Plate 

 lX.figs. 195, 196.) 



