EUSTS. 105 



species of rust [TricJiohasis oblongata), tlie spores of 

 which are deeper in colour than in the sedge rust 

 (plate VIII. figs. 158, 159). 



Amongst the remaining species of TricJiobasis 

 (the reader must pardon our using the generic 

 name, as we have no equivalent), that found on 

 the leaves of various composite plants is the most 

 common {TricJiobasis Oiclioraceariini, Lev.). It 

 occurs on some thistles, on the saw-wort, dandelion, 

 several species of hawkweed, and similar plants. 

 The pustules are small and more diffused than in 

 the species found on Gnicus arvensis, and they as 

 often appear on the upper as on the lower surfaces 

 of the leaves. 



On umbelliferous plants three species are re- 

 corded; one with yellow spores {TricJiobasis Petro- 

 selini, B.) ; another with a blistered habit, and 

 brown, ovate, or oblong spores {T, Umbellatarum, 

 Lev.) ; and a third with tawny, obovate, or egg- 

 shaped spores {T. Heraclei, B.), which is found 

 solely on the cow-parsnip. The species of Puc- 

 cinia corresponding to some of these species of 

 TricJiobasis are known, but, in other cases, pro- 

 bability, or speculation if you please, occupies the 

 place of knowledge. 



During the month of September, 1864, it was 

 our good fortune to spend a week in revisiting the 

 scenes of our boyhood, and exploring the minute 

 botany of one of the marshy districts of East Nor- 

 folk. One day of the seven, memorable to us for 



