74 CLASSIFICATION 



B. Pedicellate. 



V. Pucciniaceae — Teleutospores distinctly pedicellate 

 though the pedicel is often very short or caducous, united 

 into pulvinate son, easily separable or immersed in gelatine, 

 each spore consisting of one or more cells arranged in rows or 

 groups. Germination by an external basidium ; basidiospores 

 more or less ovate. ^Ecidia with or without peridium. Uredo- 

 spores always abstricted singly on distinct pedicels. 



The following genera belonging to these families are British, 

 excluding Uredinopsis : 



MELAMPSORACEiE. 



A. Teleutospores composed of 2 — 4 laterally adherent cells, the septa 

 in the latter case cruciately arranged. 



a. Teleutospores colourless, scattered singly in the host-tissues or 



formed in the epidermal cells. On Ferns. 

 [1. Teleutospores extracellular, scattered. Uredospores surrounded 

 by a peridium, colourless, without germ-pores. Uredinopsis.] 



2. Teleutospores intracellular. Uredospores surrounded by a 



peridium, colourless, without evident germ -pores. Milesina. 



3. Teleutospores intracellular. Uredospores without (or with a 



very rudimentary) peridium, yellow, with germ-pores. 



Hyoh>jixi,f<i. 



b. Teleutospores brownish, in the epidermal cells or forming 



subepidermal crusts. On Seed-plants. 



1. Teleutospores intracellular. jEcidiospores without smooth 



spot. Calyptospora. 



2. Teleutospores intracellular. jEcidiospores smooth on one side. 



Thecopsora. 



3. Teleutospores extracellular, subepidermal. jEcidiospores 



smooth on one side. Pucciniasti'um. 



B. Teleutospores one-celled, united into crusts. 



a. Teleutospores in the epidermal cells, usually one-celled, faintly 



coloured. Uredospores with peridium, but without para- 

 physes, and without evident germ-pores. JSeidium with a 

 peridium. Melampsorella. 



b. Teleutospores not intracellular, one-celled, brown. 



1. Teleutospores subepidermal. Uredo- and secidiospores as 

 above. Melampsoridiu m . 



■2. Teleutospores subepidermal or subcuticular. Uredospores 

 without peridium, but with paraphyses. Jicidium of the 

 cseoma type. Melampsora. 



