ON PRIMULACE^ 181 



scattered or circinate, minute, surrounded by the torn epidermis, 

 brown ; spores globose to ellipsoid, echinulate, pale-brown, 

 20—32x18—28/*; epispore thick (2— 3/*), with three germ- 

 pores. 



Teleutospores. Sori similar, but black-brown; spores ellipsoid 

 to ovate-oblong, with a broad paler apical papilla (5 — 8 \x high), 

 gently constricted, usually rounded below, smooth, brown, 35 — 

 55 x 20 — 34 ^ ; pedicels hyaline, deciduous, up to 50 /x long.] 



On Soldanella alpina (Botanic Garden, Glasgow). All three 

 spore-forms are said to occur together on the same plant in 

 July and August. 



The secidium stage is most common ; its mycelium is perennial and 

 diffused through the plant, and causes a conspicuous change in the leaves ; 

 they become smaller, paler, and longer-stalked. Only this stage seems 

 to have been met with in Britain ; no doubt on imported plants, as has 

 happened with P. Gentianae, P. Pazschhei, etc. Description of the uredo- 

 and teleuto-stages after Sydow. 



Distribution : Central Europe. 



53. Puccinia Hydrocotyles Cooke. 



Caeoma Hydrocotyles Link, Sp. Plant, ii. 22. 



Trichobasis Hydrocotyles Cooke, Journ. Bot. ii. 344 ; Handb. p. 530 ; 



Micr. Fung. p. 225, pi. 8, f. 168—9. 

 Puccinia Hydrocotyles Cooke, Grevillea, ix. 14. Ph. et PL Grevillea, 



xiii. 53. Plowr. Ured. p. 195. Sacc. Syll. vii. 641. Sydow, 



Monogr. i. 388. 



\jEcidiospores. iEcidia amphigenous, distributed pretty 

 uniformly over the whole leaf, rarely single, cup-shaped, with 

 a yellowish deeply cut revolute margin ; spores punctate, pale- 

 yellowish, 19 — 26 /i.] 



Uredospores. Sori amphigenous, scattered, now and then 

 confluent, often circinate round a central larger one, very 

 minute, long covered by the epidermis, at length naked, pul- 

 verulent, cinnamon; spores subglobose or ellipsoid, echinulate, 

 brownish, 24 — 34 x 20 — 27 /x, with two conspicuous germ- 

 pores. 



