CRYPTOGAMIA FUNGI. 193 



Hab. On the inferior surface of elm leaves, not rare. 



In our specimens, the spots formed by this parasite are white 

 and cottony-like, resembling, in some respects, the covering 

 of the Aphides. The matter diffuses readily in water, and 

 it consists entirely of minute slender filaments (sporidia), 

 slightly curved, and divided by some imperfect septae. 

 These are the seminiferous tubes which have escaped from 

 a capsule lying immersed in the substance of the leaf. 



107. PUCCINI A. 



* Capsules with more than two cells. 



1. P. Rosa, capsules cylindrical, many-celled, mucronate, opake, 

 reddish-brown, on a rather long pellucid stalk thickened at the 



base PURT. Mid. Fl. iii. 301. t. 28. GREV. Crypt. Fl t. 15; 



Fl. Edin. 428. P. mucronata, , HOOK. Scot. ii. 17. 



Hab. On the under surface of the leaves of the dog and 

 burnet roses, frequent; more common on the garden 

 rose. Summer. 



Scattered over the leaf in minute black tufts, often intermixed 

 with a yellow Uredo, as represented in the figure given by 

 Mr PURTOX, who did not distinguish the plants. 



2. P. Rubi, capsules cylindrical, 4-celled, mucronate, opake, 

 blackish-brown, the stalk elongate, slender, bulbous at the base. 

 PURT. Mid. FL ii. 726. iii. 507. Sow. Fung. t. 400. f. 9. GREV. 

 Fl. Edin. 428. P. mucronata, j3, HOOK. Scot. ii. 18. 



Hab. On the under surface of the bramble, common, in 

 small black tufts. Autumn. 



3. P. gracilis, capsules cylindrical, 7 or 8-celled, mucronate, 

 opake, blackish, on a slender stalk thickened at the base. GREV. 

 Fl. Edin. 428. P. rubi-ida>.i, DECAND. Fl. Franc, vi. 54. 



Hab. On the leaves of the wild raspberry, scattered in 

 small black spots. Dulaw Dean. Aut. 



Often intermixed with an orange-coloured Uredo. 



4. P. Potentillcs, capsules cylindrical, 4 or 5-celled, obtuse, 

 brown, on a hyaline filiform stalk GREV. Crypt. Fl. t. 57 ; FL 

 Edin. 428. P. Fragarice, PURT. Mid. FL iii. 304. 



VOL. n. I 



