330 



(K'HKOI'SOKA 



JUcidiospores. 



.Kcidi.i scattered pretty regularly over the 

 lower surface of the leaves, not very 

 crowded, shortly cylindrical, white, 

 with born revolute margin; spores 

 irregularly oblong, colourless, thin- 

 walled, very delicately verruculose, 

 18— 30 x 15— 21/*. 



[Uredospores. Sori hypophyllous, 

 small, roundish, scattered, not more 

 than \ mm. diam. ; spore-mass grey- 

 ish or yellowish-white, surrounded 

 by a circle of paraphyses. which form 

 a kind of peridium, but their upper 

 ends, when mature, are free and sub- 

 clavate; spores subglobose to ovate, pale-brownish, distantly 

 verrucose, 25— 28x18— 25 /u; epispore 1 — l^yu, thick, with no 

 perceptible germ-pores. 



I i. . 248. 0. Sorbi. Meid- 

 iiim leucospermum. a.secidia 

 on Leaf of .1. nemorosa, nat. 

 size : b, the same, x2 ; c, 

 secidiospores, x 600. 



Fig. 249. 0. Sorbi. Section of teleuto-sorus, before the division of the spores 

 * into four cells (one spore is shaded) ; a, basidiospores. (After Fischer.) 



Teleutospores. Sori hypophyllous, ^— \ mm. diam., at first 

 covered by the epidermis, pustulate, pale flesh-colour, roundish 

 or oblong, clustered in groups; spores cylindrical, rounded 

 above, crowded, grey, granular, subopaque, 70x10 — 18 fi, at 

 length divided into four cells; basidiospores fusiform, 22- 

 25 x 8 p.] 



iEcidia on Anemone nemorosa, April — June, not common, 

 Oxford, Cambridge, Devon, North Wales, Yorkshire, Scotland, 

 etc. [Uredo- and teleutospores on Pyrus Aucuparia, August 

 and September, not yet observed in Britain.] (Figs. 248, 249.) 



