02 MICROSCOPIC FUNGI. 



le presence of a peduncle in the early stage of 

 'richobasis (plate VII. fig. 169), and its absence 

 I all stages of Uredo. Without wandering fur- 

 ler into a subject which has not the merit of 

 ems very popular, let us away to some green 

 me in search of violets, and having found them, 

 ike a little of the brown dust from one of the 

 nail pustules on the leaves, upon the point of a 

 enknife ; place this, with a drop of water, upon a 

 lass slide, and make a record of what we observe. 



The field is covered with the myriad spores of a 

 ist of a nearly spherical shape, brownish in colour, 

 ad here and there one with a short transparent 

 olourless stalk or pedicel. This is the violet rust 

 Trichohasis Yiolan-wm, B.), very common all through 

 le summer and autumn, generally on the under 

 iirface of the leaves of violets, in woods and 

 edgerows. Should it so happen that the spores 

 ■hen placed under the microscope are found to be 

 vo-celled, it will prove that instead of a rust, or 

 Vichobasis, being under examiuation, a brand, or 

 'uccinia, has been found, which is almost equally 

 Dmmon, and which may, without such a test, be 

 isily mistaken for a rust. According to the theory 

 f di-morphism, this is the higher form or complete 

 Tiit of the same fungus, which in its simple-celled 

 iate is called Trichobasis Violarwm. 



A similar circumstance may befaU. the student in 

 samining the rust of labiate plants {Trichobasis 

 labiatarum, Lev.), which occurs on different species 



