APPENDIX. 219 



MBLiMPSOEA, Cast. 



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

 or without a covering, wedge-shaped. Berk. Ouil., p. 333. 



Melampsora Euphorbise, Cast. Hypophyllous ; sori of 

 summer spores goldeu-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, JE. exigua, and other species of Spurge. Common. (Plate 

 IX. figs. 193, 194.) 



Melampsora Poptiliiia, L6v. Hypophyllous, epiphyllous, 

 or amphigenous, at first yellow or orange ; summer spores 

 obovate-oblong, attenuated or truncate, echinulate ; parapbyses 

 obovate, capitate or claviform, abundant in fully-ripenecf 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, 5-6 together, yellowish, smooth.— On leaves of 

 Popuhs nigra. Common. Spores perfected in February. (Plate 

 IX figs. 193, 196.) 



Melampsora TremulsB, Tul. Hypophyllous; sori of 

 summer spores punctiform, prominent, or papillseform, numerous ; 

 spores tawny-yellow, elliptical or obovate; paraphyses slender; 

 sori of perfect spores scattered, at length blackish; spores 

 elongated, compressed, attenuated downwards, yellowish. — On 

 leaves of Populus tremula. Common. Spores perfected during 

 the winter. 



Melampsora Betulina, Desm. Hypophyllous; sori of 

 Slimmer spores bright yellow or orange, oblong, cylindrical, or 

 obovate, trunc"i.te at the base, echinulate ; parapbyses encircling 

 or intermixed, obovate, smooth, hyaline ; sori of perfect spores 

 confluent, of an obscure brown in the winter, becoming of a bright 

 orange when mature ; spores elongated, attenuated below, poly- 

 gonal, ochraceous. — On leaves of Betula alba. Common. Spores 

 perfected in January and February. (Plate IX. figs. 189, 190.) 



Melampsora Salicina, L6v. Epiphyllous or hypo- 

 phyllous; sori, or heaps of summer spores, scattered, pale orange, 

 bright orange, or cinereous; spores ovato-globose, paraphyses 

 capitate, rarely obovate ; sori of perfect spores epipbyllous, 

 scattered or aggregate, at first yellowish-tawny, then brownish, 

 at length nearly black, buUate ; spores oblong, closely packed. 



