222 YORKSHIRE NATURALISTS UMON. 



Class MYXOPHYCE^. Genera. Species 



Old. nORMOGONEA\. 



Sub-ord. HetekoCYSTE.E. 



Fam. RIVULARIACE/E 4 7 



Fam. SIROSIPHONIACE.l-: 2 S 



Fam. SCYTONEMACE.F 4 8 



Fam. NOSTOCACE.E 4 18 



Sub-ord. HOMOCYSTEM. 



Fam. VAGINARIE.E i 3 



Fam. LYNGBYE.F: 



Siib-fam. Lyngbyoide.k 3 10 



Sub-fam. Oscillatokioide.e 4 24 



Sub-fam. Spiruli.\oide.3i; i 2 



Ord. CHAAL-ESIPHONACEyE i i 



Old. CHROOCOCCOIDEyE. 



Fam. CIIROOCOCCACE/E 



Sub-fam. Chroocyste/E i 2 



Sub-fam. EUCHROOCOCCACE.E 15 44 



Class BACILLARIE^. 

 Ord. RAPHIDIE^. 



Fam. CYMBELLE/E 



Fam. NAVICULE.F 



Fam. GOMPHONEME.E 



Fam. ACHNANTHE.E 



Ord. PSE UD OP A PHI DTE. E. 



Fam. EPITHEMIE.E 



Fam. SYNEDRE.E; 



Fam. FRAGILARIE/E 



Fam. MERIDIONID^ 



Fam. DIATOMEiE 



Fam. TABELLARIE.E 



Fam. SURIRELLE.E 



Fam. NITZSCHIE/E 



Ord. CRYPTOP APHID lE^E. 



Fam. MELOSIRE.E 



Fam. COSCINODISCIDE.E 



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. Y.N.U., igoi (pub. July 1901). liot. Scries, Vol. 5. 



