DER 
af Skand. hafsalger. Stockh. 1857, p. 8; Nägeli, Morph. u. Syst. d. Ceram., Sitzber. Münch. Akad. 
1861, II, p.387; J. Areschoug, Observ. phycol. III, Upsal. 1875, p. 10, Tab. I, fig. 4; Bornet et Thuret, 
Notes algologiques, I, 1876, p. 41, pl. 13; Schmitz, Untersuch. Befr. Florid., Berlin 1883, p- 224, 230, 
etc., Taf. V fig. 8-15; Oltmanns, Z. Entwickl. d. Florid., Botan. Zeit. 1898, p. 109, Taf. V: Oltmanns, 
Morph. u. Biol. d. Algen I, 1904, p. 572, 698; Kolderup Rosenvinge, Hyaline unicell. hairs, Biol. Arb. 
til. E. Warming, 1911, p. 205, fig. 1—2, 
Fucus capillaris Hudson, Fl. Angl. 1762, p. 591. 
Gigartina lubrica Lyngbye, Hydroph., p. 45, Tab. 12 A ‘teste specim.). 
The structure of the frond has been described by NÆGEL1 (1861), BorNET and 
THURET (1876) and OLrmanns (1904); reference may be made to the quoted works. 
The outer cells of the frond contain narrow branched chromatophores; the number 
of the latter could not be determined. The 
Danish specimens, collected in June to August, 
were always provided with numerous hyaline 
hairs, at least on the young parts of the frond, 
but sometimes also on the older parts (comp. 
KOLDERUP ROSENVINGE |. c.). Strange to say, 
they have not been mentioned and figured by 
BoRNET (l. c.) who examined plants collected 
at St. Malo in June. On the other hand, Kuckuck 
has found hairs terminal on the erect filaments 
given off from the germ-disc (fig. 356 in OLT- 
MANNS’ Morph., p. 572). 
As shown by Kuckuck in the figure 
quoted, several fronds are given off from a 
monostromatic basal disc bearing on its upper 
Fig. 200. 
Gloiosiphonia capillaris. Sporelings. À and B two 
face numerous short simple orslightly branched days old, C three days, D 6 days, E 10 days and 
c F 29 days old. 350:1. 
cell-filaments. The fronds arise by transforma- 
tion of some of these filaments; one of the fronds shown in the figure mentioned arises 
from a branch of a cell-filament. The fronds are divided by transversal walls in low 
segments, early producing verticillate branches, and afterwards dividing by vertical 
walls. — The earlier stages of development have been studied in July 1914 at Hirshals, 
where the carpospores were brought to germinate (fig. 200). The globular spores after 
having been fixed to the substratum, e. g. a slide or a cover-glass, surround them- 
selves with a membrane, and frequently show the first signs of germination within 
24 hours, a germinating tube being produced at one side and separated from it by 
a wall. The circular spore-body is frequently divided by a wall, the orientation of 
which to the germinating tube is not constant. After 2 days the germinating fila- 
ment was 3—4 times as long as the spore-body, usually two-celied, the ultimate 
cell being densely filled with protoplasm, while the undermost were almost empty, 
and the spore-cell as well. Sometimes two germinaling tubes are given off from the 
same spore, either diametrically opposed or diverging under an obtuse angle. After 
four days the first germinating spores had produced long germinating filaments which 
