38 MICROSCOPIC FUNGI. 



whicii are derived from tlie spermogones^ and' 

 which have not yet been known to germinate ; 

 Stylospores, produced either singly, or in bead-like, 

 or moniliform, strings, and which either precede or 

 are associated with the true spores ; Spores , some- 

 times simple, but often complex; and Sporidiaj or 

 secondary sporules, which are produced on the 

 germinating threads of the true spores. 



The various genera of these endophytes owe 

 their distinctions to the form, or mode of develop- 

 ment of their true spores. In one instance these 

 spores are united in pairs, or divided by a septum,, 

 so that they are two-celled : these are named Puc- 

 cinia. In another instance the spores are one- 

 celled, and at first borne upon a stalk or peduncle, 

 from which they are detached in ripening : such 

 are called Trichohasis, It is unnecessary here to 

 indicate all the variations to illustrate the fact that 

 the generic distinctions are based upon the cha- 

 racters of the true spores. How unsatisfactory- 

 such a mode will appear, when subjected to expe- 

 rience day by day, a botanist would suspect. In: 

 the same pustule, resting upon the same cushion oF 

 mycehum, the spores of an Aregma will be found- 

 with those of a Lecythea, and those of a Puccinia 

 with Trichohasis. More than this has even been, 

 affirmed. The alternation of generations, known 

 to students in the animal world, is here repeated in 

 the vegetable. Dr. de Bary declares that certain 

 data appear to indicate that JEcidium constitutes. 



