170 



I'liciMA 



Fin. 120. /'. Veronicarum. 



leutospores on V. alpina 

 herb. Berkeley). 



Te- 

 (ex 



compact, pulvinate and greyish, other- brown and pulverulent; 



spores oblong or obovatej attenu- 

 ated into a horny much thickened 

 (up to >i fi) conical point at the 



apex, constricted, slightly tapering 

 below, smooth, pale or dark chest- 

 nut-brown, 28 — 40 x 14 — 19 /x : 

 pedicels hyaline or somewhat yel- 

 lowish, rather long, deciduous or 

 persistent. 



On Veronica alpina, V. offici- 

 nalis and perhaps other species. Not common. July — October. 

 (Fig. 120.) 



There are two forms of spores in this species ; one, //•"//////".<, with 

 deciduous pedicels ; the other, penlst <■,>.<, with persistent pedicels. In the 

 former, the sori are soon naked and pulverulent, the spore-wall is thicker 

 and darker-coloured, and germination takes place only after a winter's 

 rest. In the latter, the sori are compact, the spores are thin- walled and 

 paler and germinate as soon as mature, upon the living plant. But 

 occasionally both forms may be seen in the same sorus. It is the latter 

 form that spreads the parasite during the summer ; the former causes 

 new infections in the following spring. 



Distinguished from P. Veronicae by the relatively broader spores, and 

 the cone-shaped apical thickening. It is possible that the Puceiniae on 

 other species of Veronica, included by the Sydows with this, are really 

 distinct. But in Herb. Berkeley there is a Puccinia on Veronica alpina, 

 from Ben Aulder, Invernessshire (and also from Perthshire) which is 

 undoubtedly this species. The sori are hypophyllous only, but cover the 

 larger part of each leaf. The spores are quite smooth, by which it is 

 distinguished from the continental form on V. a/pixa, which has the upper 

 spore-cell occasionally warted on the upper part ; this form (P. albulensis 

 Magn.) has the sori densely gregarious on stems as well as leaves, some- 

 times covering a whole internode. 



Distribution : Europe generally. 



43. Puccinia Menthae Pers. 



JEcidium Menthae DC. Flor. fr. vi. 95. Cooke, Handb. p. 544 ; Micr. 



Fung. p. 199. 

 Tridwbasis Labiatarum Lev. ; Cooke, Micr. Fung. p. 224 p.p. 

 T. Clinopodii DC. ; Cooke, Micr. Fung. p. 224 (?). 



