30 



Proceedings of the Royal Irish Academjj. 



V. — Conjugate, {a) 



Staurastrum — continued. 



qiiadr angular e Br eh, L. 



Eeinschii Boy. M C U. 



scabrum Br^h. L U. 



Sebaldi Beinsch. M L C U. 



senarium Balfs. L. 



setigerum Cleve. L. 



sexangulare Babenh. M C. 



sexcostatum Breb. M L U. 



sinense Liitkem. U. 



spongiosum Breb. M L C. 



striolatum Arch. L C. 



subgracillimum W. d G. S. West. 

 U. 



subpygmfeum West. C. 



subscabrum Xordst. C U. 



teliferum Balfs. M L C U. 



tetracerum Bcdfs. M L C U. 



Tohopekaligense WoUe. C. 



trachygonum West. C. 



tracbynotum West. M. 



tricorne Menegh. M L C. 



tumidum Breb. M L 0. 



turgescens De Not. M L U. 



verticillatum Arch. C. 



vestitum Bcdfs. M L (J. 

 Tetmemorus 



Brebissonii Bcdfs. M L C U. 



granulatus Balfs. M L C U. 



lajvis Bcdfs. M L C U, 



minutus De Bary. L. 

 Xanthidium 



aculeatum Ehr. M L U. 



antilopseum Ki'itz, M L C U. 



DESinDiACE^E — continued. 



Xanthidium — continued. 



apiculiferum West. C, 

 armatum Buibenh. M L C U. 

 bisenarium Ehr. CjU. 

 Brebissonii Balfs. L. 

 concinnum Arch. M C. 

 cristatum Breb. M L C- 

 fasciculatum Ehr, M L G U. 

 Eobinsonianum Arch. M L U. 

 Smithii Arch. M C. 

 subbastiferum West. M C. 

 variabile W. c& G. S. West. 

 MCU. 



Doubtful Species. 

 Arthrodesmus 



glaucescens Wittr. M C. 



Closterium 



contortum Arch. L. 



Cosmarium 



cbondrosporum Arch. L. 

 ellipsoideum Arch. L. 

 erosum Arch. L. 

 odontopleurum Arch. L. 



Cylindrocystis 



purpurascens Arch. L. 

 striolatum Arch. L. 



Euastrum 



Armstrongianum Arch. C. 



Staurastrum 



brachycerum Breb. L. 

 rostratum Arch, L. 

 stellatum Beinsch. L. 



