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APPENDIX. 213
Coleosporium. Petasitis, Ler. Butterbur Kust ;
on
the under surface, minute, depressed, spreading, somewhat aggregate,
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, confluent,
plane, on the under surface ; spores subglobose, cohering,
yellow, at length pale. On leaves of various Campanulse. September
and October.
Coleosporium SoncM-arvensis, Lev. Sow-thistle
Rust ;
on the under surface, depressed, irregular in form, scattered,
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 becoming
black, small, roundish, spores prismatic, membrane thickened
above, dark brown.—On leaves and stems of Euphorbia helioscopia,
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.)