OX JUNCACE.-E 



237 



spores ellipsoid to ovate, echinulate, pale-brown, 18 — 26 x 15 — 

 22 jx ; epispore rather thick, with two germ-pores. 



Teleutospores. Sori similar, but compact, pulvinate, covered 

 or surrounded by the cleft epidermis, blackish-brown ; spores 



Fig. 183. P. obscura. Teleutospores; two mesospores, one germinated in 

 the sorus ; and two uredospores ; all on L. campestris. 



oblong, rounded, rarely truncate or conical above and thickened 

 (5 — 9 /m), gently constricted, usually attenuated below, smooth, 

 brown, 30 — 48 x 14 — 20 fx ; pedicels subhyaline, persistent, up 

 to 30 /j, long ; mesospores frequently intermixed with the teleu- 

 tospores. 



^Ecidia on Bellis perennis, September — December; uredo- 

 and teleutospores on Luzula campestris, L. silvatica. June — 

 November. Not common, except locally. (Fig. 183.) 



Teleutospores are rarely produced, and I have seen them only on dead 

 leaves ; the fungus can winter by its uredospores, and in such cases, of 

 course, the recidium will not be formed. It is probably in consequence 

 of this that the secidia and the uredospores are frequently not found near 

 one another ; there is a great difference in their mode of occurrence in 

 different districts. The uredospores sometimes show a small smooth 

 spineless area just below the germ-pores. Fischer records them in 

 Switzerland on Luzula maxima and L. pilosa in September, and Sydow 

 includes all the species (except L. areuata) which grow in Britain. 



The hetercecisrn of this parasite was first demonstrated by Plowright ; 

 the secidia differ from nearly all others in being produced in late autumn 

 and winter. According to him, the teleutospores, when they occur, are not 

 formed till August and September, and germinate after a short resting 

 period ; thus the succeeding phase arises on the Daisy usually about 

 October. I have found that the spermogones (which are not mentioned by 



