. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 194 pucciNiA 66. Puccinia Heraclei Grev. Trichobasis Heraclei Berk. ; Cooke, Micr. Fung. p. 225. Puccinia Heraclei Grev. Scot. Cr. Flor. pi. 42. Cooke, Handb. p. 502 ; Micr. Fung. p. 208. Sydow, Monogr. i. 387. Fischer, Ured. Sohweiz, p. 132. P. Pimpinellae Strauss ; Plowr. Ured. p. 155 Spermogones. Amphigenous, scattered amongst the secidia, pale-yellowish. JEcidiospores. .^cidia hypophyllous, frequently on the petioles and especially on the nerves of the leaves, on thickened yellowish spots, densely crow
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 194 pucciNiA 66. Puccinia Heraclei Grev. Trichobasis Heraclei Berk. ; Cooke, Micr. Fung. p. 225. Puccinia Heraclei Grev. Scot. Cr. Flor. pi. 42. Cooke, Handb. p. 502 ; Micr. Fung. p. 208. Sydow, Monogr. i. 387. Fischer, Ured. Sohweiz, p. 132. P. Pimpinellae Strauss ; Plowr. Ured. p. 155 Spermogones. Amphigenous, scattered amongst the secidia, pale-yellowish. JEcidiospores. .^cidia hypophyllous, frequently on the petioles and especially on the nerves of the leaves, on thickened yellowish spots, densely crowded in irregular clusters, often causing distortion, between cup-shaped and pustulate, sometimes almost spherical and superficial; peridium feebly developed, opening by a rounded pore; spores delicately verruculose, yellowish, 21—32 x 18—28 /i. ^ciei TEoidia on Uredospores. Sori amphigenous, scattered, BeracUum (re- minute, chestnut-brown; spores globose to ellipsoid, densely echinulate, pale-brown, 25— 32 X 19—27 ft,, with three or four germ-pores. Teleutospores. Sori similar or more or less confluent on the nerves, surrounded by the ferruginous epidermis, pulverulent, blackish; spores ellipsoid, rounded at both ends, hardly con- stricted, reticulated, brown, 26—37 x 18—27 /j. ; pedicels hya- line, short, deciduous. On Heracleum Sphondylium. .^cidia, March—June; teleu- tospores, August. Not common. (Fig. 142.) This species closely resembles P. Chaeroph^/Ui, but is distinguished by its less densely reticulated teleutospores. Semadeni proved by experi- ment that they are distinct species, but no one has as yet reared all the spore-forms of P. Heraclei from the basidiospores, as has been done for P. Chaerophylli. The secidia of this species are more conspicuous than those of its allies ; they occur in swollen patches, reminding one of the secidia on Smyrniwm Ohisatrinn, and being sometimes almost spherical and superficial might be compared to a group of miniature Pc
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