152 



INTRODUCTION TO CRYPTOGAMIC BOTANY. 



ciliated appendages (Fig. 26, c.) at one extremity, by means of 

 ■which they move about with an apparently spontaneous motion. 

 Whether quiescent or active, the spores, after a time, become 

 attached at one end by two or three root-like processes, the en- 

 dochrome divides, and new threads are formed. Derb^s describes 

 these spores as sometimes breaking up into numberless minute 

 zoopores, and this appears to be the case in CE. lyulchellum, 

 as communicated to me by Mr. Thwaites. The microgonidia, 

 which are supposed to be true antheridia, have already been 

 described and figured. (Fig. 26, a.) There is, however, still 

 ample room for fresh investigation. 



124. In many cases it is not merely the division of a fertile 

 cell, or the junction of two contiguous endochromes, which 

 gives rise to the spore, but that of the endochromes of two 

 distinct threads, parallel to each other and connected by 



Fig. 39. 



Threads of Tliwaitesia Buricei, Mont., magnified from sketclies com- 

 municated to mc by Dr. Montague. 



means of little processes mutually put forth from their 

 sides. In those cases the spores are frequently formed in 

 the connecting tube, the two dissepiments being previously 

 absorbed. In some cases, however, though the lateral tube 

 is protruded, union does not take place, and the spore is 

 formed in the protruded tube. Union does not, however, always 



