ON UMBELLIFER/E 



195 



67. Puccinia Chaerophylli Purt. 



Puccinia Chaerophylli Purton, Midi. Flor. iii. 303. 



i. 367. Fischer, Ured. Schweiz, p. 129, f. 98. 

 P. Pimpinellae Str. ; Plowr. Ured. p. 155 p.p. 



Sydow, Monogr. 



Spermogones. Pale-yellow, roundish. 



JZcidiospores. /Ecidia on the leaves and petioles, on the 

 leaves scattered or circinate, on the petioles and nerves in 

 dense elongated clusters and causing a slight hypertrophy, 

 between cup-shaped and pustulate, yellowish ; peridium poorly 

 developed ; spores verruculose, orange, 18 — 35 x 16 — 26 p. 



Uredospores. Sori hypophyllous, scattered, minute, roundish, 

 pulverulent, cinnamon ; spores globose to obovate, echinulate, 

 pale brownish-yellow, 20 — 30 x 18 — 25 p ; with three usually 

 equatorial germ-pores. 



Teleutospores. Sori similar, but black-brown, on the petioles 

 more elongated ; spores ovate to oblong, 

 rounded at both ends or gently at- 

 tenuated below, not thickened above, 

 slightly constricted, reticulated, yellow- 

 ish-brown or brown, 24 — 36 x 16 — 25 p\ 

 pedicels hyaline, thin, as long as the 

 spore or shorter. 



On leaves, petioles, and stems of 

 Anthriscus silvestris, Chaerophyllum 

 temulwm, Myrrhis odorata. Not com- 

 mon. ^Ecidia, May and June ; teleuto- 

 spores, July — October. (Fig. 143.) 



Fig. 143. P Chaerophylli. 



Teleutospores, a, on 

 Anthriscus, b, on Myr- 

 rhis. 



It was proved experimentally by Klebahn that this parasite is not 

 identical with P. Pimpinellae, and by Semadeni that it is not identical 

 with that or with P. Heraclei. The latter also reared spermogones and 

 secidia from the basidiospores, and uredo- and teleutospores from the 

 Becidiospores, of P. Chaerophylli; thus proving that all the spore-forms 

 described above belong to the same species. The feeble development of 

 the peridium and the pustule-like, not cup-shaped, aecidia are paralleled 

 by those of P. Heraclei. The markings on the teleutospore are formed by 

 a network of low ridges, with small polygonal or roundish meshes. The 

 spore-reticulation is exactly of the same character as that of P. Pimpinellae 

 except that the meshes are a little smaller and not quite so easily seen. 



13—2 



