. The British rust fungi (Uredinales), their biology and classification. Uredineae. 162 PUCCINIA rarely observed. I have poiuted out elsewhere that it is on spring flowering plants of this kind that Micropuccinise would naturally arise (as well as on alpine plants), if they are the result of an adaptation to a shortened vegetative period. Uromyces Ficariae may be taken as another instance of a similar character. 35. Puccinia albescens Plowr. Mcidinm, albescens Grev. Fl. Edin. p. 444, Cooke, Handb. p. 536 ; Micr. Fung. p. 194. Puccinia albescens Plowr. Ured. p. 153. Fischer, Ured. Schweiz, p. 1
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 162 PUCCINIA rarely observed. I have poiuted out elsewhere that it is on spring flowering plants of this kind that Micropuccinise would naturally arise (as well as on alpine plants), if they are the result of an adaptation to a shortened vegetative period. Uromyces Ficariae may be taken as another instance of a similar character. 35. Puccinia albescens Plowr. Mcidinm, 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 Sacc. Syll. vii. 612 Sydow, Monogr. i. 203 Bpermogones. Scattered among the secidia, yellowish. ^cidiospores. 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 ^. 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/a, 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/x; pedicels hyaline, Teleutospores. delicate, short, deciduous. On Adoxa Moschatellina. The secidia appear in April or even in March, uredo- and teleutospores in May and June. Apparently not uncommon in the secidium 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 natui'al state, although Schroter, Nielsen, Soppitt and Fischer have all produced them in small quantity artificially from the secidiospores; the
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