4i6 PLANT DISEASES 



brown, pedicel short, hyaline, deciduous ; paraphyses 

 numerous, brown. 



**** Leptopuccinia, Schrot. — Teleutospores only known, 

 generally in compact, crowded, pulvinate sori germinat- 

 ing on the living host ; sori often powdered with the 

 whitish or rufescent sporidiola. 



Puccinia malvacearum, Mont., Gay's Hist.fis.y.polit. de 

 Chile, viii. p. 43. — Hypophyllous, sori hemispherical, hard, 

 gregarious, small, brown ; teleutospores ovoid-oblong, 35-75 

 X 12-26 /i, fuscous, smooth, slightly constricted at the 

 centre, obtuse or acuminate, pedicel very long ; up to 

 120 yu., hyaline. 



Puccinia arenariae, Schrot., Pike Schles., p. 345. — 

 Teleutospore sori rounded, pulvinate, often arranged in an 

 orbicular manner or in elongated crusts, pale brown, then 

 blackish-brown, often becoming pulverulent and greyish 

 from the sporidiola ; spores fusoid or clavate, apex rounded 

 or conoidly incrassated, slightly constricted, base narrowed, 

 ochraceous-brown, smooth, 30-50 X 10-20 /n; pedicel hyaline, 

 equal or longer than the spore, persistent. 



Gymnosporangium, Hedw. — Teleutospores forming large 

 subgelatinous masses distinct from the substratum, rarely 

 forming small, adnate, convex patches, transversely 

 i-septate, very rarely biseptate, each cell with 2 or 4 

 germ-spores. 



All known species have spermogonia and aecidia on 

 one host, teleutospores on another distinct host; uredo- 

 spores unknown. 



Gymnosporangium sabinae, Winter, Krvpt.-Flora, i. 

 p. 232. — Spermogonia rufous-orange, then black, conoidly 



