72 MICROSCOPIC FUNGI. 



"Nortli Kent Eailway, in August or September, 

 where the burnet is plentiful,, and the leaves will 

 present the appearance of having been peppered 

 beneath^ from the number of minute pustules of the 

 burnet brand scattered over the under surface 

 (fig. 30, upper leaflets). Or if you prefer collecting 

 nearer home, visit some neighbouring garden, if 

 your own does not contain many roses, and the 

 leaves will be found equally prolific in an allied 

 species (fig. 36). Should gardens and roses be 

 alike unattainable, any bank or wood will furnish 

 the barren strawberry {Potentilla fragariastrum), 

 and during the latter part of the summer, or 

 in autumn, another species of Aregma will not 

 be uncommon on the under surface of the leaves 

 (fig. 33). All these species will be found accom- 

 panied by the orange spores of species of Lecythea, 

 which some mycologists consider to be distinct 

 fungi, and others to be merely forms or conditions 

 of Aregma. These spores are represented in plate 

 III. figs. 31, 34, 37, and 40. From the magnified 

 figures of the spores of the difi'erent species of 

 Aregma (figs. 32, 35, 38, 41, and 43), it will be 

 apparent that they have all certain features in 

 common, i.e., cyhndrical spores containing from 

 three to seven cells. This may be called the generic 

 character, common to all the species of the genus 

 Aregma. Again, each species will be observed to 

 possess its own distinct features, which may be 

 termed its specific character. In one, the apex of 



