THE FRESH-WATER ALGJE OF NORTH YORKSHIRE. 295 



Class PHYCOCHROMACE^. 



Order Cystiphore^. 



Family Chroococcace^. 



ChroococcKs cohmrens 'Rag. M. — C. turgidus 'i^l'ag. Frequent. — 

 C, macrococcus Rabb. S. 



Glceocapsa polydermatica Kg. St. — G. arenaria Rabb. St. 

 Aphanocapsa rivularis B.d.hh.. M., Sc. — A. Grevillei^dMh. M. 

 Meiismopedia glauca Nag. St., M., Sc. 



Order Nematogen^e. 

 Family Nostoce^. 



Nostoc muscorum kg. St. — X humifmum Carm. M. — N. cmru- 

 leum Lyngb. S., M. — X. verrucosum Vaucb. M. 

 SphcBrozyga elastica Ralfs. M. 



Family Lyngb y^e. 



Spirulina oscillarioides Turp. Sc, M., St. 



Oscillaria tenerrima Kg. M., Marske. — 0. leptotncha Kg. Moor- 

 cock, M. — 0. mriigescens Drumm. C. — 0. tenuis kg. M. — Forma 

 viridis. M., Se. — 0. muscorum Carm. Moorcock, S. — 0. limosa kg. 

 M., St. — 0. irrigua Kg. River Ure. — 0. nigra Vaucb. S., Sc. — 

 0. Frdlichii Kg. S., Sc, Masbam, Moorcock. 



Lynghya vidgans Kircb. St. 



Family Scytoneme^. 



Scytonema myochrous kg. C. 



Tolypothrix mgagropila Kg., var. pygmcea Kg. Upper Teesdale. 



Stigonema mamillosum Kg. C. — S, turfaceum Cooke. C. 



Class RHODOPHYCE^. 

 Family Batrachosperme^. 

 Batrachospei'mum vagum kg. Sc, Castle Howard. 



Class DIATOMOPHYCE^. 

 Family Melosire^e. 



Melosira varians kg. Frequent. — 21. nivalis Sm. Lockton. — 

 M. orichalcea Kg. Rokeby. 



Family Surirell^e. 



Campylodiscus spiralis Sm. C. 



Surirella linearis Sm. C, S., M. — S. panduriformis Sm. M., 

 Rokeby. — *S'. hiseriata Breb. M., St., S., Sc. — *Sf. angusta Kg. 

 Marske, St., Rokeby. — *S'. splendida Kg. St., Sc. — .S'. nohilis Sm. 

 M. — 5'. ovalis Breb. Se., Staitbs.— ^S'. ovata Kg. St., Wbitby.— 

 S. mimita Br^b. St., M., Se., Reetb. — S. innnata Sm. St., Dal- 

 ton, Se. 



Cymatopleura ellijJtica Sm. C— C. Solea Sm. Frequent. — C. 

 apiculata Sm. M. 



