NOTES ON FRESHWATER ALG : 297 
There i is no doubt that S. Fargquharsonii is merely a more depressed 
li 
er of the ¢ell-wall. We have autly” obtained this 
iety in abundance from Hampsfell, TiAtioshsiea ig. 21.) 
nei URASTRUM PYGMHuUM Bréb. Zygospore globose, mamil- 
tien, ldeeihe conica unaquaque spina longa tenue preedita, apicibus 
spinarum bis bifurcatis ee ae Diam. zygosp. sine spin. 
36-37 p, cum spin. circiter 67 (Fig. 12.) 
Hab. Cautley Spout, W. Yorks. 
We hav eked zygospores of this species from Tete Portugal, 
and they sunieed exactly with those from Yorksh must 
therefore aaa the zygospore figured in Ralls Brit. Desm. 
t. xxxv. f. 26¢ as immature with regard to its 
e Rhicttainis observed from Cautley siya “(with zygospores) 
were rather more depressed than usual, and the lines of granulation 
an a little facthae apart. Long. 29-81 p; lat. 29-380 p; lat. 
ist 9p 
3 
zygospore en this species for caumeee with tha M meum, 
It was obtained from a pond in Darenth Wood, Kent. Diam. 
zygosp. sine spin. circ. 29 », cum spin. cire. 42 p. (Fig. 13.) 
83. STAURASTRUM ear Boldt, ‘ Siber. pened 3 Ofvers. af 
K. Vet.-Akad. Férh. 1885, 0. 2, p 432, fs We have 
recently found this rare pose in abundahes fr rom nes Yorks, and 
also from N. Wales. The typical form has only previously Pata 
recorded from Siberia, ere Roy ~~ a var. inornatum as 
‘extremely rare; near Alford, Aberdee e give a figure o 
some of s N. Wales examples, thick. were from a boggy spring 
on Y Foel Fras. Brae 85-5-38°5 uw; lat. 82°5-38°5 »; lat. isthm. 
9°5- is ps (Figs. 1 -18.) 
SraurastRuM Borexanum Schmidle, ‘Lappmark u. Vester- 
sae adiew. -alg.,’ Bih. till K. Sv. Vet.-Akad. Handl. 1898, Bd. 24, 
Afd. iii. no. 8, p. 60, t. iii. f. 7. We obtained this characteristic 
species in some abundance — a bog near Widdale rm N. Yorks 
35. Sraurastrum Lacreruemn Schmidle, l.c. p. 63, t. iii. f. 10. 
This species is merely a short-armed variety of S. anatinum Cooke & 
Wills. Specimens of S. anatinum frequently possess one semicell 
almost exactly similar to the form described by Schmidle as 
S. Lag eng It has shorter processes than either var. truncatum 
West or var. biradiatum West, but the arrangement of the verru- 
pbentow is on exactly the same plan 
86. Sraurastrum SEBaupI Réttiach: var. aLtuM (Boldt) West & 
G. §. West in Trans. Linn. Soc. Bot. ser. 2, vol. v. 1896, p. 267. 
