104 MiCROSconc fungi. 



and steins are covered, from the bean rust {TricJw- 

 hasis FcibcBj Lev.), which in like manner is con- 

 sidered as the simple stage or form of the bean 

 brand {Puccinia Fahce, Lk.). If the legumes are 

 also examined, a few pustules will sometimes be 

 found on them. 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 {Trichohasis Betes jJjgv.) 

 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- 

 chohasis Polygo7iorum, B.), which nearly covers the 

 leaves, till the entire plants seem to be smothered 

 in Scotch snufi*. 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 Garex, the upper surface of the leaf has 

 corresponding pale spots, and the pustules them- 

 selves are surrounded by a yellowish margin. This 

 species [Trichohasis caricina) is far from uncommon 

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

 belonging to the genus I/iiziila have also their own 



