2J2 YORKSHIRE NATURALISTS UNION. 



Class MYXOPHYCEiE. Genera. Species. 



Ord. IIORMOGONEA-:. 



Sub-ord. ffETEROCYSTE.E. 



Fam. KIVULARIACE.E 4 7 



Fam. SIROSIPHONIACE-E 2 S 



Fam. SCYTONEMACE.E 4 8 



Fam. NOSTOCACE/E 4 18 



Sub-ord. HoMOCYSTE.E. 



Fam. VAGINARIE.E i 3 



Fam. LYXGBYE.E 



Sub-fam. Lyngbyoide.e 



Sub-fam. OsCILLATORIOIDE.li 



Sub-fam. Spiruli.noide.e 



Ord. CHAMMSIPHOKACE.^ 



Ord. CHROOCOCCOIDE.^. 



Fam. CHROOCOCCACE.E 



Sub-fam. Chroocyste.e 



Sub-fam. Euchroococcace.e 



Class BACILLARIE.(E. 

 Ord. KAPHIDIEJE. 



Fam. CVMBELLE.E 



Fam. NAVICULEv^i 



. Fam. GOJIPHONEME.E 



Fam. ACHNANTHE.E 



Ord. PSEUDORAPHIDIE.'K. 



Fam. EPITHEMIE.-E 



Fam. SYNEDRE^ 



Fam. FRAGILARIE/E 



Fam. MERIDIONID.^i 



Fam. DIATOME^ 



Fam. TABELLARIE.E 



Fam. SURIRELLE^ 



Fam. NITZSCHIE^ 



Ord. CRYPTORAPBIDIE.E. 



Fam. MELOSIRE.E 



Fam. COSCINODISCIDE.* 



Total ... 189 1044 



Some ten or a dozen species which have at different times 

 been recorded for the county are much too doubtful and un- 

 certain for inclusion in this flora. 



Trans. \".X.U., igoi (pub. July 1901). Bot. Series, Vol. 5. 



