ON THE DKSMIDIK-E OF NORTH WALES. 



15 



excellent medium " The Midland Naturalist," takintj the lead in the 

 introduction of this simple but important reform. 



The following list of Desmidieao comprises those found in the neigh- 

 bourhood of Capel Cnrig during the month of August, 1880, to which 

 are added some few taken during previous visits to North Wales. 



It necessarily includes the common as well as the rare species. 

 Those which have not hitherto been recorded from English habitats, 

 but which have been detected in Ireland or Scotland, are indicated by 

 an asterisk ; those which have not been hitherto discovered in the 

 United Kingdom, but which are known as European, American, or 

 Arctic species, by two asterisks. 



Abbrf.viations. 



Breb., De Brebisson. 

 Ehr., Ehrenberg. 

 Hass., Hassall. 

 Kiitz., Kiitzing. 

 Lund., Lundell. 



Menegh., Meneghini. 

 Niig., Niigeli. 

 Nords., Nordstedt. 

 Wittr., Wittrock. 



*Gonatozygon Brebissonii,De Bary, 



Ralfsii, De Bary. 

 Hyalotheca dissiliens, Breb. 



mucosa, Ehr. 

 Didymoprium Borreri, Ralfs. 



Grevillei, Kiitz. 

 Desmidium aptogonum, Breb. 



Swartzii, Agardh. 

 Sphaerozosma excavatum, Ralfs. 



vertebratum, Ralfs. 

 •Spondylosium pulchellum, Archer. 

 *Tetrachastrum mucronatum, 



[Dixon. 



oscitans, Hass. 



pinnatifidum, Kiitz. 

 *Micrasterias angulosa, Hantsch. 



Americana. 

 ** ,, forma major, 



[Reinsch. 



crenata, Breb. 



denticulata, Breb. 



fimbriata, Ralfs. 



furcata, Agardh. 



Jeuneri, Ralfs. 



papillifera, Breb. 



radiosa, Agardh. 



rotata, Ralfs. 



truncata, Bri-b. 

 Euastrum affine, Ralfs. 



ampullaceum, Ralfs. 



ansatum, Ehr. 



binale, Ralfs. 

 * ,, var. angustatum, 

 rWittr. 



Euastrum crassum, Kiitz. 



cuneatum, Jenner. 

 Didelta, Ralfs. 

 elegans, Breb. 

 gemmatum, Breb. 

 iusigue, Hass. 

 oblongum, Ralfs. 

 pectinatum, Breb. 

 verrucosum, Ehr. 

 Cosmarium bioculatum, Breb. 

 biretum, Breb. 

 Botrytis, Menegh. 

 Brebissonii, Menegh. 

 coelatum, Ralfs. 

 connatum, Breb. 

 conspersum, Ralfs. 

 crenatum, Ralfs. 

 Cucumis, Corda. 

 Cucurbita, Breb. 

 *cyclicum, Lund, 

 cyliudricum, Ralfs. 

 granatum. Breb. 

 *Holmieuse, Lund 

 ** ,, var. 



* *l8eve, Nordst. and Wittr. 

 margaritif erum , 



[Menegh. 

 Meneghinii, Breb. 

 inoniliforme, Ralfs. 

 **nitidulum, de Notaris. 

 *Nymannianum, 



[Grunow 

 orbiculatum, Ralfs. 

 ornatum, Ralfs. 



