294 THE FRESH-WATER ALG^ OF NORTH YORKSHIRE. 



lo7igipes 'i^ord. St. — S. sexcostatiufi 'Bveb. C, M. — S . niargaritaceum 

 Meneg. Frequent. The form having nine processes in end view 

 and the abnormal form were from Mickle Fell. 



Family Zygnemace^. 



Zygnema pectinatum Ag. S. — Z. parvulum Cooke. C, St. — Z. 

 cruciatum Cooke. C. — Z. stellinum kg. M., C, Cotterdale. — Z. 

 Vaucherii Ag., var. stagnale Kirch. M. — Z. anomalum Cooke. 

 M., C. This was a frequent species on these Fells. 



Spirogyra crassa Kg. Sc. — S. nitida Link. Sc. — S. condensata 

 Vauch. S., Eeeth, Eiver Ure. — S. ^on^aia Vauch. M., C, Sc. S., 

 — S. jiavescens Cleve. Sc, C, St. — S. Weheri Kg. Eiver Ure. — 

 S. tmuissima Hass. Sc, Eiver Ure. — Forma infiata Cooke. C. 



Zygogonhun ericetorum D. By., var. aqiMtlcum CookQ. Frequent. 



Mesocarjms nummuloides D. By. C, Masham, Moorcock. — M. 

 depressus Cooke. M., C, Sc, Eiver Ure. — M. parvxdus D. By. M., 

 C, Sc, Masham. — Var. angustus Hass. M. — M. scalaris D. By. 

 Frequent. — M. recttrvus Cooke. St. — M. pleurocarpus D. By. M., 

 Moorcock, Se. 



Staurospermum gracillimum Cooke. M., St., C, S., Cotterdale. 



Order Siphophyce^. 

 Family Botrydiace-e. 

 Vauchena sericea Lyngb. S. 



Order Nematophyce^. 

 Family CoNFEP.vACE-aE. 



Microspora fugacissima Ag. Common. — 3f. vulgaris Eabh. C, 

 St., Sc. — M. Jioccosa Thur. Frequent. 



Conferva fontinalis Berk. M., C, Cotterdale. — C. tenerrima Kg. 

 Common. — C. homhycina Ag. Common. 



Cladophora crispata Kg. Near Middleton. — C. glomerata Kg. 

 C, St., S. 



Family (Edogoniace.e. 



(Edogonium vernale Wittr. Masham. — CE. Vaucherii A. Br. C. 

 — (E. undulatum A. Br. S. — (E. caicareum Cleve. C. — (E.punctato- 

 striatwn D. By. St. 



Family ULOTRicHEiE. 



Horviiscia vwnilifonnis Eabh. Frequent. — H. zonata Aresch. 

 Common. — H. hicolor Cooke. Cotterdale, Moorcock, Eiver Ure. 



Ulothrix tenerrima Kg. Frequent. — U. tenuis Kg. Eiver Ure. — 

 U. radicans Kg. St. 



Family ChroolepidevE. 



Chroolepus aureus Kg. C, Moorcock. 



Family CnyETOPHORACE^. 



Microthamnion vexator Cooke. M., S., Masham, Sc, Se. 



Stigeoclouium temic Ag. Sc, Moorcock Inn. 



Chcetophora elegans Ag. M., Cotterdale. — C. endivafolia Ag. St. 



