Hetei'tiro77tyces. 1 3 1 



Biology. — This species has been the subject of many cultures by 

 me. It has been stated that the uredospores are provided with para- 

 physes ; in this country they certainly are not. It has been affirmed, 

 too, that Ranwicuhts repens and acris bear the jecidiospores ; but in 

 numerous cultures, many of which were serial {i.e. the same infecting 

 material was simultaneously applied to a series of plants), no result 

 was obtained on the above-named plants (A*, acris and repois). The 

 series included R. bulbosns, and on it, and on it alone, the aecidium 

 developed, the other species named above (/?. repens and actis), as 

 well as R.Jicaria and auricomus remaining free from the parasite ; 

 conversely, the £Ecidiospores from R.biilbostis applied to Poa pratensis 

 and tri7nalis produced no result. 



For a detailed account of these cultures, see Quart. Jour, of 

 Micro. Science., vol. xxv., new series, pp. 152-156. 



Uromyces pose. Rabh. 



ALcidiospores — Similar to the preceding. Spores 15-20/^111 diameter. 



Uredospores — Sori orange, rounded, elliptical, or linear ; at first 

 covered by the epidermis, which splits longitudinally. Spores 

 rounded, elliptical, or ovate, finely echinulate, orange-yellow 

 16-26/X in diameter, without paraphyses. 



Tcleutospores—^on brown, small, punctiform or elongate, covered 

 by the epidermis. Spores generally irregular in form, often 

 elliptical or ovate, pale brown, with a smooth epispore, 17-25 

 X 25-40/x. Pedicels 'long, narrow, rather persistent. 



Sy/ionyins. 



.Mcidium ficaricR. Pers., " Obs. Myc," vol. ii. p. 23. Purton, 

 " Midi. Flor.," vol. iii. p. 333. Sow, t. 397, fig. 4. 



^cidiuvi ranunculacearum, D. C. in part. Cooke, " Hdbk.," 

 p. 539; "Micro. Fungi," 4th edit, p. 196, plate ii. figs. 12-14. 

 Johnst., " Flor. Berw.," vol. ii. p. 206. Berk., " Eng. Flor.," vol. v. 



p. 370- 



/Ecidium confcrtinn. Grev., " Flor. Edin.," p. 446. Johnst., 



" Flor. Berw.," vol. ii. p. 205. 



Uromyces poa;. Rabh., " Unio. Itin." (1866), No. xxxviii. 



Winter in Rabh., " Krypt. Flor.," vol. i. p. 162. 



Exsiccati. 

 Cooke, i. 8 ; ii. 87 ; " L. F.," 55. Vize, " Fungi Brit.," 72. 



