. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON UMBELLIFERiE 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 /jl. Uredospores. Sori hypophyllous, on pale minute spots 2—3 mm. diam., scattered, rarely aggre- gated, minute, punctiform, pale-cinna- mon ; spore globose to ellipsoid, echinu- late, not thickened above, brown, 25— 38x18—27 fi; epispore thick (up to 3^ /J,), wi
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON UMBELLIFERiE 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 /jl. Uredospores. Sori hypophyllous, on pale minute spots 2—3 mm. diam., scattered, rarely aggre- gated, minute, punctiform, pale-cinna- mon ; spore globose to ellipsoid, echinu- late, not thickened above, brown, 25— 38x18—27 fi; epispore thick (up to 3^ /J,), with two (rarely three) germ-pores, with slightly swollen caps. Pig. 131. P. Samculae. Teleutospores. Sori similar, but dar- 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/x; pedicels hyaline, thin, deciduous. On Sanicula europaea. Common. .<3Ecidia, 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. JEcidiospores. ^cidia 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—26x10—20//,. 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. Please note that these
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