ON RUBIACE^E 



165 



dZcidiospores. ./Ecidia hypophyllous, scattered or collected 

 in orbicular clusters on roundish or oblong paler spots, shortly 

 cylindrical, with a short white recurved margin ; spores 

 globose or broadly ellipsoid, orange-yellow, somewhat smooth, 

 16— 23 ft, 



Uredospores. Sori hypophyllous, minute, roundish, on the 

 stems linear, reddish-brown, often confluent ; spores globose to 

 ovate, aculeolate, pale-brown, 22 — 30 x 17 — 23 /x, with two or 

 three germ-pores. 



Fip. 11-5. P. punctata. Teleutospores ; a, on G. saxatile ; b, on G. palustre ; 



c, on G. verum. 



Teleutospores. Sori similar, but black, compact, and per- 

 sistent ; spores ellipsoid to clavate, truncate, rounded or coni- 

 cally attenuate above, where they are much thickened (up to 

 14 jju), and often darker, slightly constricted, tapering below, 

 brown, smooth, 30 — 56 x 14 — 24 fi; pedicels brownish above, 

 persistent, thick, about as long as the spore; a few mesospores 

 occasionally. 



On leaves and stems of Galium Gruciata (?), G. Mollugo, 

 G. palustre, G. saxatile, G. uliginosum, G. verum. Not uncom- 

 mon. iEcidia, June ; teleutospores, August and September. 

 (Fig. 115.) 



The forms of P. punctata on these various species of Galium differ 

 considerably in the shape and size of the teleutospores, and have been 

 divided into several biological races. On G. Aparine there is a distinct 

 species, P. difformis (q.v.) ; but it is possible that P. punctata also occurs 



