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PUCCINIA 



Becidium-stage appears in Maj and June, often abundantly. This applies 

 especially to the parasite on Bupleurum falcatum, which is probably 

 identical with that on B. tenuissimum, but the Walton plants bore flowers. 



Distribution: Europe, Asia Minor, East Indies, Yunnan. 



f>2. Puccinia iEthusae .Mart. 



Uredo Petroselini DC. Flor. fr. ii. 597. 



Trichobasis Petroselini Berk. ; Cooke, Micr. Fung. p. 223 (?). 



T. Cynapii DC. ; Cooke, Micr. Fung. p. 224. 



Puccinia JEthusae Mart. Flor. Mosq. ed. ii. \>. 22-"> 1817 . Cooke, 



Micr. Fung. p. 209. 

 p. bullata Wiut. ; Plowr. Ured. p. 185 p.p. 

 /'. Petroselini Lindr, Faun, et Flor. Fenn. xxii., no. 1, p. 84 (1902 . 



Sydow, Monogr. i. 399, 889. Fischer, Ured. Schweiz, p. 1 1 2. 



f. 86. 



Spermogones. Hypophyllous, yellow-brown, or almost hya- 

 line. 



Credo* pores. Sori generally hypophyllous, scattered or in 

 small clusters, very small, occasionally confluent and larger, 

 pulverulent, cinnamon; spores globose to ellipsoid, echinulate 

 either all over or only in the upper part, thickened above 

 (5 — 6 jjl), yellowish or brownish-yellow, 22 — 29 x 21 — 25 fi, with 

 three (rarely two) equatorial germ-pores with conspicuous caps. 

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



and stems often larger, confluent and 

 elongated ; spores ellipsoid or ovate 

 rounded at both ends or slightly at- 

 tenuated below, not thickened above, 

 hardly constricted, smooth or nearly 

 so, brown. 28 — 48 x 18 — 25 /x : pedicels 

 hyaline, thin, short, deciduous. 



On JEthusa Cynapium, Petroselinum 

 sativum. Not common. June — Oc- 

 tober. (Fig. 138.) 



It is possible that the forms on these two hosts are distinct species, or 

 at least biological races. Semadeni showed (Centralbl. f. Bakter. 2. xiii. 

 443) that, while he could infect several (non-British) species of Umbelliferae 

 with uredospores from dSthusa Cynapium, he could not infect Petroselinum 

 sativum ; at the same time he could find no morphological difference 



Fig. 138. P. Mthusae. 



Teleutospore and uredospore 



on AZthusa. 



