204 CRYPTOGAMIA FUNGI. 



speculations of the vaguest kind relative to the metamor- 

 phosis of vegetables into animals, and of these again into 

 plants ! 



36. U. caries, always inclosed within the grain, and filling it 

 with a uniform, dense, foetid, blackish -brown mass composed of 

 minute spherical capsules. HOOK. Scot. ii. 16. GREV. Fl. Edin. 

 443. 



Hab. Within the grains of wheat. 



The Smut of the agriculturist. Unlike the preceding, this 

 never appears externally, so that some farmers remain 

 ignorant of its existence in the corn, until it passes 

 through the thrashing-mill, when the fetid smell im- 

 mediately discloses the injury. Those who know the 

 fungus can discover the diseased heads by a difference in 

 their colour so slight that it escapes the eye of the bota- 

 nist. The Uredo renders the grain more swollen and tur- 

 gid ; and on bruising it, we find it filled with a black pow- 

 der, of a very disagreeable smell. In some years this dis- 

 ease is productive of considerable loss to the farmer, and is 

 less under the preventive influence of the pickle than the 

 Uredo segetum. 



37. U. urceolarum, attacking the fruit of Carices, and forming a 

 black compact slightly pulverulent mass, composed of a pale solid 

 nucleus, surrounded by the naked capsules, which are small and 

 globular GIIEV. Fl Edin. 443. 



Hab. The fruit of Carices (C. prcecox, stellulata et recurva), 

 not uncommon. 



38. U. flosculorum, capsules very minute, purplish-brown, plen- 

 tiful, produced within the florets, and often filling them with a 

 pulverulent mass. GREV. Fl. Edin. 443. Farinaria scabiosa, 

 Sow. Fung. t. 39fi, f. 2. 



Hab. The flowers of the field-scabious, rare. 



109. jECIDIUM. 



1. JE. Epilobii, scattered over the whole leaf, distinct, nume- 

 rous, cup-like ; margin of the cover raised, white, with revolute 

 teeth ; disk orange-coloured GREV. Fl. Edin. 444. 



Hab. On the under side of the leaves ofEpilobium montanum. 



