104 MICROSCOPIC FUNGI. 



and stems are covered, from the bean rust (Trlclio- 

 basis Fabce, Lev.), which in like manner is con- 

 sidered as the simple stage or form of the bean 

 brand (Puccinia Fabce, Lk.), the true bilocular 

 spores of which we have never succeeded in finding 

 or seeing. Beans thoroughly infected with this 

 rust or brand are seldom of much service in either 

 field or garden. 



Beetroot, or mangold wurzel, is another example 

 of garden and field produce which is subject to a 

 similar visitation. This rust often has very red 

 spores when produced on red varieties of beet. 

 During September, 1863, it (Trichobasis Betce,Jjev.) 

 was sent us on the leaves of the wild beet (Beta 

 maritima) . 



All the species of Polygonum are exceedingly 

 subject to the attacks of the Persicaria rust (Tri- 

 chobasis Polygonorum, B.), which nearly covers the 

 leaves, till the entire plants seem to be smothered 

 in Scotch snuff. If it were allowable to affirm of 

 any plants that they are martyrs to parasitism, such 

 might be said of the Persicarias and their allies. 



Sedges are subject to the attacks of a rust much 

 resembling the corn rust. When it occurs on some 

 species of Car ex, the upper surface of the leaf has 

 corresponding pale spots, and the pustules them- 

 selves are surrounded by a yellowish margin. This 

 species (Trichobasis caricina) is far from uncommon 

 (plate VIII. figs. 170, 171). The sedge-like plants 

 belonging to the genus Luzula have also their own 



