FRESHWATER ALG. 29 
35. LyNGBYA ScoTTI* sp. n. 
(Pl. IL. figs. 91-93.) 
Filis angustis, plerumyue valde tortuosis, interdum subrectis, stratum in superficie 
Phormidii formantibus ; vaginis primo tenuibus hyalinis, demum modice incrassatis 
extus rugosis cum particulis numerosis adherentibus, non lamellatis ; trichomatibus 
cum cellula apicali acuta conica, non capitatis aut attenuatis, plerumque modice inter 
cellulas constrictis ; cellulis tam longis quam latis vel paulo longioribus, plerumque 
eytoplasmate homogeneo, dissepimentis indistinctis, sed interdum cum granulis dense 
agerecatis In utraque parte dissepimentarum ; calyptra nulla. 
Diam. fil. = 3°4—-5 p; diam. trich. = 2°6-3 p. 
Hab.—Gyranite Harbour, January 20th, 1902. 
This species should be compared with Lynyhya hiitzingi Schmidle, and_ its 
variety distineta (Nordst.) Lemm. (= ZL. subtilis West). It differs from these forms in 
the thickened rugose sheath of older filaments, in the acutely conical apical cell, the 
slight constriction between the cells and the occasional granulation of the dissepiments. 
The adhesion of small particles to the rough surface of older sheaths is a marked 
characteristic, as the bulk of the filaments showed it. 
Var. MINOR var. nov. (PI. II., figs. 94-96). 
Filis angustioribus, plerumque valde tortuosis ; vaginis tenuibus hyalinis ; 
trichomatibus cum cellula apicali acuta conica, interdum paulo attenuatis, modice inter 
cellulas constrictis; cellulis tam longis quam latis vel paulo longioribus, contentu 
homogeneo. 
Diam le 25-227... diam trich, = 1-5—1-8) p: 
[lab.—Gap pond, Winter Harbour, February 20th, 1904 (forming a stratum on 
Phormidium). 
This variety differs chiefly from the type in its smaller dimensions and in the 
apparent absence of thickening of the sheath in older filaments. The cell-contents 
were in all cases homogeneous. 
36. LYNGBYA LAGERHEIMI. 
(Pl. IL., figs. 74-78.) 
Lyngbya lagerheimii (Mob.) Gomont, fom. cit., pp. 147-148, Pl. IV., figs. 6, 7 CSpirocoleus lagerheimii 
Mobius, Hedwigia, 1889, p. 312, Tab. 10, figs. 1, 2). 
Diam. fil. = 3=3°5 pp; diam. trich. = 2-3 p. 
Hab.—Freshwater pond in eskers upon ice, halfway between Black Island and 
Brown Island, January 3rd, 1903. 
* This species is named after Captain Scott, C.V.O., the leader of the British National Antarctic Expedition 
{and of the British Antarctic Expedition, 1910]. 
