:;:;.; 



MELAMPSORA( I.I 



MKLA.MPSORACK.K 



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 secidia with or without 

 a peridium. 



/ MelniiipSoru.. 



Melampsoridium. 

 M ii a.mi'surk.k. Teleutospores brown or brownish, Mrl<i,-„j,.«jr<:lhi. 

 on Seed-plants. Pueeiniastrwm. 



Thecopsora. 

 Calyptospora. 

 IHy'ilopxnra. 

 Hyalopsore^e. Teleutospores hyaline, on Ferns. -' Milesina. 



[ Uredraopsis. 



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 paraphrases. ^Ecidia of the 

 cseoma-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, M. Lint, is found in Britain, 

 and one other, M. alpina on arctic and alpine species of 

 Saxifraga 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 Salix and (to a 

 smaller extent) Populus are themselves in a state of flux, 

 evolving many closely related species and possessing many 



