156 puccinia 



clavate, or oblong-, thickened at the apex, brownish, 45 — 

 60x20 — 25yu.; paraphyses numerous, reddish-brown, clavate 

 and somewhat thickened at the apex.] 



On Solicit us arvensis, S. asper, S. oleraceus. Uredospores 

 only seen, July — September. Rather rare (Fig. 107.) 



In Sydows 1 Monographia this species is said to be confined to the 

 neighbourhood of the coast or nearly so. It h;is lieen recorded by Prof. 

 Trail at Aberdeen, by Mr Johnston at Berwick-on-Tweed, by Mr J ). A. Boyd 

 from Ayrshire; also from Sutton, near Askern, and Mulgrave Woods in 

 Yorkshire; I have received specimens from Mr Hawkes collected near 

 Birmingham, from Mr Phillips near Hull, from Mr T. B. Roe near 

 Scarborough, and from Mr J. Adams at Howth, Co. Dublin, and Westport, 

 Co. Mayo. 



It is a remarkable species, and worthy of close investigation. Though 

 the uredo is sometimes confounded with Coleosporium Sonchi, it is readily 

 distinguished by its brown paraphyses which form only a single row 

 round the sori and are easily seen with a lens through the epidermis as a 

 dark line surrounding the yellow spore-layer. It resembles at first sight 

 an £ecidium, and has been more than once described as such : but it opens 

 by a pore the edges of which do not curl back. The so-called paraphyses 

 are really the upper part of a delicate imperfect peridium, composed of 

 hyaline pseudo-parenchyma (cells 5 — 10 fi diam.) ; at the top these cells 

 become elongated, linear, parallel, at first colourless, then brownish and 

 more or less clavate, and finally very dark brown, subopaque and irregular. 

 This colour is retained for many years in the dried specimens, though the 

 spores are bleached. The peridium resembles in some respects that which 

 surrounds the uredo-sori of Melampsorella Caryophyllacearvm. The spores 

 themselves are at first sight like a;cidiospores, with thick colourless walls, 

 and yellowish contents, the sculpture resembling that of the a?cidiospores 

 of EndophyUum. Ultimately the wall becomes thinner and brownish; the 

 spores are borne singly on pedicels, like ordinary uredospores. 



Tranzschel (Ann. My col. 1909, vii. 182) sowed the teleutospores on 

 S. arvensis and obtained spermogones, followed by the uredospores. This 

 species is widely different from a typical PvAcinia. 



Distribution : Western Europe, Algeria, Canaries, Japan. 



30. Puccinia Crepidis Schrot. 



Puccinia Crepidis Schrot. Pilze Schles. p. 319. Sacc. Syll. vii. 607. 

 Sydow, Monogr. i. 64. Fischer, Ured. Schweiz, p. 207, f. 163. 



[Spermogones. Scattered amongst the Eecidia, nearly always 

 present, in little clusters of 6 — 10, brownish. 



