138 
not mention if the basal disc figured by him (l. c. fig. 10) belonged to an asexual 
or a sexual plant. 
The species attains in the Danish waters a length of 5 mm., but it is rela- 
tively seldom more than 3 mm. high. As mentioned above, the asexual plants are 
as a rule smaller than the sexual ones; however I have found in the Little Belt 
a specimen with monosporangia measuring 5 mm. in 
length. It grows principally on other Algæ; I have 
recorded it on 15 different species, most frequently on 
Delesseria sangvinea, Furcellaria, Desmarestia aculeata, 
Cystoclonium purpurascens, Polysiphonia elongata, further 
on leaves and roots of Zostera, on tubes of Hydroids, 
Ascidians, shells of Buccinum and finally on stones. It 
has been met with in depths of 7,5 to 38 meters, most 
frequently 11 to 23 meters. In the following list of 
localities the depth is only indicated when it is outside 
the last named limits. It is interesting that this sub- 
arctic species has been met with in nearly all the 
Danish waters, also in the Baltic, but not in the Lim- 
fjord nor in other shallow waters where the summer 
temperature is comparatively high. 
Localities. Ns: AG near the Jutland Reef, 28 met. — Kn: 
FG, Herthas Flak; FH near Frederikshayn 4—7,5 met.; VU and VT, 
9,5 met., N. of Læsø. — Ke: FC; ZE!and VY, Fladen: IK, Lille Middel- 
grund; IA, Store Middelgrund; RL. — Km: XF, Læso channel, 8,5 met. 
— Ks: OS, Hastens Grund. — Sa: FS, Vejre Sund; YV, south of 
Hatterbarn; DK, Bolsaxen. — Lb: XP, Middelfart; common around 
Fæno. — Sb: Z; near Sprogo (Ostenfeld); Langelandsbelt: UH, UT and 
LB. — Su: bM, south of Hveen; OG. — Bw: LC, south of Lange- 
Fig. 64. 
Chantransia efflorescens. A, filament 
with monosporangia, partly emptied. land; Femerbelt: UL and KX. — Bb: XZ#, Davids Banke, 19 —20,5 met. 
B, filament with tetrasporangia. 560: 1. 
24. Chantransia pectinata Kylin. 
Kyrın (1906) p. 120. 
I have repeatedly met with a Chantransia agreeing with KyLın's description 
and figures of this species, which appears to be related to Ch. efflorescens. The 
only discordance is that in some cases I have found free descending filaments near 
the base of the erect filaments, while Ch. pectinata according to KyLın is distin- 
guished from Ch. efflorescens just by the want of such filaments. They occur how- 
ever seldom and are not so long as in the latter and they appear to have partly 
the character of stolons, growing out in horizontal direction (fig. 65 C). In spite of 
the presence of these filaments I regard the two named species as quite distinct, 
Ch. pectinata being characterized by thicker filaments, shorter, more thick-walled 
cells and by the sporangia-bearing branchlets being seriate on the inner side of the 
lateral filaments. 
