TAB. CXXXIX. 



UREDO LONGISSIMA. 



A OA Aquatica, very plentiful in one part of Lambeth 

 Marfli, bears this paralite on the fohage early in au- 

 tumn, which gives the appearance of the fru6lification 

 of an AJplenhim. It feems nearly allied to '^.fegetum 

 of Bull. /)/. 472. yff. 2. (viz.) the fmut,as it is common- 

 ly called, of the corn ; but this fine duft is brown, and 

 imbedded in longitudinal ftreaks in the fubftance of the 

 foliage, covered by the epidermis, which it burfts on 

 the front, and is vifible by being tranfparent at the 

 back. The fmut feems a change of the fubftance of 

 the feed, covered by its epidermis, and is much blacker. 

 See Uftulata xwBibliotheca BankJiana,yo\. 3. p. 422, and 

 431. The French call it Ergot. Uredo is a new genus 

 of Perfoon, in his work on Fungi. 



T A B. CLX. 



UREDO FRUMENTI. 



IVluCH too common on wheat in low places, or where 

 too clofely fown, efpecially after rain in the early part 

 of autumn. This takes pofleffion of the foliage like 

 the laft, but rather in fliape of upright fliort clavated 

 threads,black at the top, appearing fcorchedat the bafes, 

 in lliorter fpaces, and frequently burft on both fides. 

 It alfo more commonly covers the upper and outer 

 parts of the ifem, calyx, &:c. for near two feet, feldom 

 touching the feed, although it may rtint it more or lefs 

 by weakening the plant. This is commonly diftin- 

 guiflied by the appellation of the blight. 



