. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON UMBELLIFER^ 183 brown or purple spots, in small round clusters 2—4 mm. diam., elongated on the nerves and petioles, cup-shaped, with a whitish lobed revolute margin; spores tending to become ellipsoid, delicately verruculose, hyaline, 18—26 x 15—22/a. Uredospores. Sori hypophyllous, on pale minute spots 2—3 mm. diam., scattered, rarely aggre- gated, minute, punctiform, pale-cinna- mon ; spore globose to ellij)Soid, echinu- late, not thickened above, brown, 25— 38x18—27 fi; epispore thick (up to 3^ fji), with
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON UMBELLIFER^ 183 brown or purple spots, in small round clusters 2—4 mm. diam., elongated on the nerves and petioles, cup-shaped, with a whitish lobed revolute margin; spores tending to become ellipsoid, delicately verruculose, hyaline, 18—26 x 15—22/a. Uredospores. Sori hypophyllous, on pale minute spots 2—3 mm. diam., scattered, rarely aggre- gated, minute, punctiform, pale-cinna- mon ; spore globose to ellij)Soid, echinu- late, not thickened above, brown, 25— 38x18—27 fi; epispore thick (up to 3^ fji), with two (rarely three) germ-pores, with slightly swollen caps. Fig. P. Saniculae. mi, r^ • • -1 1 i^ 1 Teleutospore and uredo- I eteutospores. Son similar, but clar- spore. ker; spores ellipsoid or oblong, rounded at both ends, sometimes slightly thickened above and provided with a small papilla, hardly constricted, smooth, brown, 26— 45 X 18—26 /i ; pedicels hyaline, thin, deciduous. On Sanicula europaea. Common, ^cidia, May and June; teleutospores, August—October; but I have found all three kinds of spores, in sheltered places, as early as April. (Fig. 131.) Distribution : Central and North-western Europe. 55. Puccinia Cicutse Lasch. Puccinia Cicutae Lasch in Klotzsch, Herb. Myc. no. 787. Sydow, Monogr. i. 372. ^Ecidiospores. ^Ecidia on the nerves of the leaves, on petioles and stems, in roundish or oblong groups as much as 1^ cm. long, pustular, with a feebly developed peridium, golden- yellow; spores globose to ellipsoid, delicately punctate, sub- hyaline, 17—26 X 10—20 ^l. Uredospores. Sori generally hypophyllous, scattered, mi- nute, punctiform, pulverulent, cinnamon; spores subglobose to ovate, echinulate, yellow-brown, 18—28 x 14—22/x, with three germ-pores. Teleutospores. Sori similar, but blackish-brown; spores ellipsoid or oblong, rounded at both ends or rarely attenuated downwards, not thickened above, gently constricted, somewhat. P
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