es) 
9) 
38 K. EH. FRITSCH. 
Diam. fil. ad bas. = 6p (fil. inflat. 9-10); diam. trich. ad bas. = 5 p (trich. 
inflat. 8-9 »); diam. fil. in media parte = 3°5 yw; diam. trich. in media parte = 3p; 
diam. heterocyst. = 5°5 w; diam. spor. = 5p; long. spor. = 8-9 p. 
//ab.—Gap pond, Winter Harbour, January 12th, 1904. 
The often much elongated and rather narrow filaments of this species present a 
very graceful appearance under the microscope. In many cases there is quite a 
gradual attenuation from base to apex (figs. 165, 172), but occasional filaments show 
a prominent inflation of the base, as seen in fig. 166. False branching of the filaments 
is rare (fig. 164). The heterocysts are slightly wider than the trichomes and are only 
rarely found in an intercalary position (figs. 164, 170); their shape is remarkably 
diverse (figs. 165, 166, 171). Only one filament with spores was seen (fig. 168), and 
it is hardly likely that they were mature. 
The species comes near to C. sandvicensis (Nordst.) Schmidle ( = Lophopodium 
sandvicense Nordst.), a form which has as yet only been found in the Southern 
Hemisphere. C. gracilis differs from it in the different shape of the spores, in the 
absence of a hair-like termination to the trichome, in the simple sheath, and the diverse 
shape of the heterocysts. It also resembles C. cartilaginea G. 8. West, superficially, 
but this species has no heterocysts and its trichomes are attenuated into hairs. 
SCYTONEMATACE. 
Genus ToLyporurix Kiitz. 
57. TOLYPOTHRIX CONGLUTINATA. 
(PI IM; fiess'455°146.) 
Tolypothrix conglutinata Borzi, Note alla Morf. e Biol. d. Alghe Ficocrom., Nuov. Giorn. bot. Ital., x1. 
(1879), p. 371; Bornet et Flahault, Rev. d. Nostoc. hétcrocyst., Ann. Sci. nat., Bot., 7 sér., v. (1887), 
p. 125. 
Diam. fil. = 16-18p; diam. trich. = 8-9; crass. parietis vagine = usque 
ad 5 p. 
Hab.—Freshwater pond, Granite Harbour, January 20th, 1902. 
Unfortunately only a single specimen of this form was found, but that was fairly 
convincing. It formed an intricate mass of numerous branches, to which fig. 145 does 
no degree of justice, but it was impossible to figure the confused tangle in its entirety. 
The false branches were very numerous and followed closely upon one another. 
They were superposed to such an extent as to make their course very ditticult to 
follow ; in many cases they were sharply incurved and more or less agelutinated with 
the main filament and other branches. The filaments had very thick sheaths (up to 
5 in thickness) with a rough edge, the sheaths being hyaline and not stratified 
(fig. 146). The cells of the trichomes were very flat (often 3-4 times as broad as long) 
with somewhat granular septa, the trichomes being slightly constricted between the 
