KUEHNEOLA 299 



thin-walled paraphyses ; spores ellipsoid or ovate, sparsely 

 echirmlate, yellow, 21 — 24x18 /a. 



Uredospores. Sori hypophyllous, small, scattered, pale- 

 orange, surrounded by thin-walled clavate paraphyses ; spores 

 roundish or ellipsoid, sparsely echinulate, yellow, about 21 x 

 18 /a; pores obscure. 



Teleutospores. Sori similar, but black ; spores cylindrical, 

 of 6 — 10 (mostly 7 or 8) cells, slightly tapering at the apex and 

 papillate, not constricted, rounded below, verrucose, brown,- 

 80 — 135x28 — 35//,; three germ-pores to each cell; pedicels 

 very long, thick, colourless, persistent, swollen towards the base. 



On Rubus Idaeus, and possibly on other species of the 

 genus. Not uncommon. June — October. (Fig- 226.) 



Lecythea gyrosa of Berkeley is the caeoma-stage, in which a pulvinate 

 ring of spores is formed round the little group of spermogones, leaving the 

 centre, at first sight, apparently unoccupied. This form is not confined 

 to the early part of the season, but may be found as late as August or 

 September. It is much rarer than the other spore-forms. - 



Although this Phragmidium is not found in America, there is a very 

 similar one, P. imitans Arthur, on allied species of Rubus, inhabiting 

 the United States and Canada, in which the cseomata are similarly formed.' 



On the cultivated Raspberry, when this disease is present, it can be 

 prevented from spreading by spraying with potassium sulphide solution or 

 dilute Bordeaux mixture. All diseased leaves should be burnt. 



Distribution : Europe, Siberia, Japan. 



KUEHNEOLA Magnus. 



Autoecious. 



Spermogones subcuticular, somewhat flattened, without 

 ostiolar filaments. Uredo-sori of two kinds : primary, i.e. the 

 equivalent of the caeomata, often surrounding the spermogones, 

 without paraphyses ; secondary, similar, but scattered, some- 

 times with paraphyses ; uredospores borne singly on pedicels, 

 with few and inconspicuous equatorial pores. Teleutospores of 



