278 
commenced to branch, producing usually alternating branches at their distal end. 
The following day a great number of the sporelings had produced a multicellular 
monostromatic disc arising by further branching and fusing together of the branches, 
and being terminal on a shorter or longer filament. After ten days the germ discs 
were larger, some of the cells were divided by transversal walls, and several hairs 
were given off from the upper surface. Some sporelings continued growing as long 
unbranched filaments, but producing no disc; they were growing obliquely upwards 
against the light. It is probably the want of contact with any solid substratum 
which has caused the absence of a disc. The cultures were continued during up 
to a month. The sporelings showed at the end of that time no essential differences; 
they were only somewhat larger, having increased by marginal growth and cell- 
divisions, and most of the cells were divided by a horizontal 
wall, which may signify that the upper cell formed may be tke 
mother-cell of a vertical filament as described by Kuckuck, but 
these filaments were not yet formed in their definite shape. 
Numerous hairs were frequently produced by the disc. Fronds 
emerging from the discs were not observed; they are probably 
Fig. 201. only produced in the following year, the plant wintering probably 
Gloiosiphonia capillaris. jn the disc-shaped stage. The outline of the discs is nearly 
Part of transversal section 4 f 
of frond with antheridia. Orbicular. The number of the cells in the basal germ filament 
670/21. is rather variable; usually it is small, and the filament may be 
wanting, the branches continuing to the spore-cell. — A similar formation of the 
germ disc, not from the spore-cell but from the germ-tube produced by it, is known 
also for other Florideæ, e. g. Dudresnaya (KırLıan, Entw. ein. Florid. Zeitschr. f. Bo- 
tanik. VI, 1914, p. 237). 
The antheridia are, as shown by BornET and THURET (I. c. p. 42) found in spots 
scattered on the plants which bear the carpogonia. They are oblong or obovate, and 
are produced by transversal divisions of narrow cells covering the surface of the 
plant. These cells branch, being divided by oblique walls (fig. 201). 
Regarding the development and structure of the cystocarps, reference may be 
made to the important paper by OLTManns in 1898 (see also 1904) where it was 
proved that the double fertilization, presumed by Scamirz for this plant, do not 
take place. 
The tetrasporangia were unknown to J. AGARDH, as late as in 1876 (Epicrisis p.115) 
although they were described by Exman in 1856 and by ARESCHOUG in 1875. They 
are, according to the named authors, cruciately divided, though often very irregu- 
larly; the sporangia-bearing specimens are much branched above, bearing dense 
bushes of branches. Such specimens were found at Christianssund on the west 
coast of Norway in August, later on the coast of Bohuslän in June by KyLın. On 
the Danish shores, sporangia-bearing specimens have never been found. All the 
specimens examined (nearly 200) were sexual plants. 
The species occurs on stones in exposed places in small depths (1—5 meters). 
