336 MELAMPSORACEH 
MELAMPSORACE/E 
Teleutospores not pedicellate, but seated on a dilated 
hyphal cell, produced singly in the tissues of the host or com- 
pacted side by side into flat crusts, one-celled or divided 
longitudinally into 2—4 cells. Germination by an external 
basidium, with minute round basidiospores (about 10 «). Uredo- 
spores abstricted singly. Uredo-sori and ecidia with or without 
a peridium. 
Melampsora. 
Melampsoridium. 
Melampsorella. 
Pucciniustrum. 
Thecopsora, 
Calyptospora. 
{ Hyalopsora. 
Hyanopsore&. Teleutospores hyaline; on Ferns. { Milesina. 
| Uredinopsis. 
MELAMPSOREH, Teleutospores brown or brownish, 
on Seed-plants. | 
MELAMPSORA Cast. 
Hetercecious, or in a few species autcecious. The sori, of all 
kinds, may be subcuticular or subepidermal. Teleutospores 
one-celled, rarely septate, compacted laterally into flat, irregular, 
dark-coloured crusts; wall coloured, smooth. Uredospores not 
enclosed in a peridium, abstricted singly, without evident germ- 
pores, intermixed with capitate paraphyses. Acidia of the 
ceeoma-type, pulvinate, without peridium and generally without 
paraphyses. Spermogones, shallow, hemispherical, without 
ostiolar filaments. 
There are seven species of Melampsora recorded for North 
America, but only one of these, A/. Lint, is found in Britain, 
and one other, M. alpina on arctic and alpine species of 
Saaifraga and Salix, in Europe. The Melampsoras on Salix 
and Populus form a very complex group; this is no doubt 
correlated with the fact that the genera Salia and (to a 
smaller extent) Populus are themselves in a state of flux, 
evolving many closely related species and possessing many 
