L62 PUCCINIA 



rarely observed. 1 bave pointed but elsewhere that it is on spring 

 flowering plants of this kind thai Micropuccinise would naturally arise (as 

 well as <>n alpine plants), if they are the result of an adaptation to a 

 shortened vegetative period. Uromycea Fica/riae may be taken as another 

 instance of a similar character. 



35. Puccinia albescens Plowr. 



JEcidium albescens Grev. Fl. Edin. p. 444. Cooke, Handb. p. 536 : 



.Micr. Fung. p. 194. 

 Puccinia albescens Plowr. Ured. p. 153. Fischer, Ured. Schweiz, 



p. 144, f. 110. 

 P. Adoxae Hedw. ; Cooke, Micr. Fung. p. 209 p.p. Sacc. Syll. vii. 



612 p.p. Sydow, Moiio»t. i. 203 p.p. 



Spermogones. Scattered among the <ecidia, yellowish. 

 jEcidiospores. Scattered uniformly over the whole surface 

 of the leaves, also on the petioles, shortly cylindrical, whitish - 

 yellow, with a deeply cut revolute margin; spores finely warted, 

 pale-yellowish, 15 — 22 /a. 



Uredospores. Sori minute, scattered singly or in little 

 clusters, soon naked, brown ; spores globose to ellipsoid, echinu- 

 late, pale-brown, 21 — 28 x 18 — 25 /j,, with two germ-pores. 



Teleutospores. Sori similar, or teleutospores at first in the 



same sori as the uredospores ; spores 

 ellipsoid to subfusiform, rounded or 

 attenuated above, with a conspicuous 

 colourless papilla, usually more or 

 less rounded below, hardly con- 

 stricted, smooth, chestnut -brown, 

 Fig. 113. P. albescens. 32 — 45 x 14 — 25/*; pedicels hyaline, 

 Teleutospores. delicate, short, deciduous. 



On Adoxa Moschatellino. The aecidia appear in April or 

 even in March, uredo- and teleutospores in May and June. 

 Apparently not uncommon in the ascidium stage, which makes 

 the affected leaves paler and dwarfed; but see the following 

 paragraphs. (Fig. 113.) 



The uredo- and teleutospores seem to be rare in a natural state, 

 although Schroter, Nielsen, Soppitt and Fischer have all produced them 

 in small quantity artificially from the secidiospores ; the latter laid affected 



