ON LABIAT.E 



173 



deciduous; a few mesospores intermixed, each with a low broad 

 pore-cap. 



On Thymus Serpyllum. June — 

 October. Very rare ; links, Aber- 

 deen (Prof. J. W. H. Trail). (Fig. 

 122.) 



The presence of the mycelium causes 

 the stems to stand more upright ; the 

 internodes are considerably lengthened, and 

 the leaves fewer, so that the affected plants 

 can be readily distinguished, as in P. 

 Betonicae. The mycelium appears to be 

 perennial, and the sori to be confined 

 almost entirely to the stems, where they 



cause a slight thickening and are more frequent at the nodes than 

 elsewhere. 



Distribution : Central and North-western Europe. 



Fig. 122. P. cauUncola. 

 Teleutospores and mesospore. 



45. Puccinia Glechomatis DC. 



P. Glechomatis DC. Encycl. viii. 245. Cooke, Handb. p. 496 ; Micr. 

 Fung. p. 204, pi. 4, f. 73—4. Plowr. Ured. p. 214. Sacc. Syll. vii. 

 688. Sydow, Monogr. i. 277. Fischer, Ured. Schweiz, p. 327, 

 f. 239. 



Teleutospores. Sori hypophyllous or on the petioles, on 

 brownish spots or sometimes none, 

 h — 1 mm. diam., roundish, solitary 

 and scattered, or more often subcon- 

 fluent into rounded clusters as much 

 as 4 mm. diam., on the stem and 

 petioles often elongated, pulvinate, 

 at first yellowish, then chestnut, and 

 at last blackish ; spores ellipsoid or 

 oblong, with an acute or rounded 

 horn-like process (8 — 12^ high) which 

 is often obliquely placed and falls off on germination, faintly 

 constricted, rounded below, smooth, pale and clear-brown, 

 30 — 48x15 — 24 /x ; pedicels hyaline, persistent, as much as 

 75 fi long; an occasional mesospore is found. 



Fig. 123. P. Glechomatis. 

 Teleutospores and mesospore. 



