J 



i 



J 



1 



i 



W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 35 



N.W.— Cronkley and Mickle Fells, frequent. 



N.E.— Strensall (W. B. Turner). Pilmoor, near Thirsk. 



125. Zygnema ericetorum (Kiitz.) Hansg. [Syn. Zy go- 



gonium ericetorian Kiitz. ; Z ericetorum var. a terrestris 

 Cooke and var. /5 aquaticum Cooke ; Z Agardhii 

 Rabenh.; Z didymnin Rabenh.]. 



On damp heaths, etc., more or less abundant, forming dark- 

 green patches, which often inclme to violet. Also frequent in 

 peaty ditches on upland moors, the filaments often attainin 

 length of several feet. The aquatic form {ioi\^'^ fluitans (Kiitz.) 

 Rabenh.) and the terrestrial form (forma ierrestre Kirchn.) are 

 practically indistinguishable, the former growing equally well on 

 damp peat, although assuming a darker colour. 



S.W.—Goole. Thornton. Harden. Keighley Moor. 



Mid W.— Bramhope (J. Abbott). Baildon. Rombald's Moor. 

 Simon Seat. Malham (C. B. Crawshaw and C. P. Hobkirk). 

 Giggleswick Common. Bowland Knotts. Ingleborough. Peny- 

 ghent. Old Cote Moor. Cray Moss. 



N.W.— Mickle, Cronkley, and Great Shunnor Fells. Swale- 

 dale, up to 2,200 feet. Mossdale Moor, Widdale Fell. Dodd 

 Fell and Lund's P^ell, up to 2,000 feet. 



N.E.— Strensali ! (W. B. Turner). Pilmoor, near Thirsk. On 



damp ground, Whitenab, Scarborough. 



126. Zygnema leiospermum DeBary. 



S.E.— Very fine, from Loftsome Bridge, near Wressle. 



127. Zygnema insigne (Hass.) Kiitz, 



Mid W. — Malham (vii. 1891). 



Genus SPIROGYRA Link, 1820. 



128. Spirogyra tenuissima (Hass.) Kiitz. 



S.W.— Frizinghall. Heaton. 



Mid W.— Hawksworth. Baildon. Buckden. 



N.W.~~River Ure. 



N.E.— Strensali (W. B. Turner). Scarborough Mere. 



129. Spirogyra inflata (Vauch.) Rabenh. 



[Syn. S. tenuisshna forma ififiata (Vauch.) Cooke]. 





