u 
it in a similar way; the figure of Harvey shows cylindrical feebly branched creep- 
ing organs radiating from the base of the stem while the disc is not distinctly 
visible. According to LYNGBYE (1819) the basal part is a “callus explanatus, fibris 
brevibus interdum instructa”. KoLkwırz found at Helgoland an extensive basal dise 
producing a number of distant erect shoots (1900 p. 52, 
WWW fig. 6), but he does not mention any creeping shoots. 
” In Danish specimens I found no creeping root-like 
organs but only a flat basal disc becoming thinner 
towards the border which has an even outline. This 
dise may sometimes have a considerable extension and 
produce numerous erect shoots (fig. 338). It is early 
formed in the sporeling; in the young plant represented 
in fig. 338 À it has increased considerably in circumfer- 
ence and has produced four new shoots. These arise 
from superficial cells. 
The development of the erect shoots has been thor- 
oughly studied by FALKENBERG and Kyrın. The growing 
point sunk in the apical groove of the shoot produces 
spirally arranged trichoblasts while the lateral branches, 
according to FALKENBERG arise as axillary shoots of the 
A trichoblasts, but only of those which are placed in two 
longitudinal rows whereby the pinnate ramification and 
the compressed form of the frond arise. FALKENBERG 
found the trichoblasts well developed only in cystocarp- 
bearing specimens having ceased to grow in length and 
to branch. According to Kyrın they are well developed 
during the development of the organs of reproduction, 
while they are very small during the vegetative devel- 
ee opment of the plant. I found them well developed and 
sathered in September (Frederiks- Visible outside the apical groove in the specimens gath- 
tte be ered in July to September; they were not visible externally 
erect shoots (Hirshals June). 3:1. in the specimens collected in winter and spring, and in 
the specimens collected in May and June they were in 
several cases long, in other cases not visible outside. The long trichoblasts were 
found both in sterile and fertile specimens (fig. 338 A). 
The antheridia are borne on cylindrical fertile trichoblasts closely placed in 
cup-shaped bodies near the tips of the shoots. These trichoblasts which cover the 
whole surface of the cup are much more numerous than the trichoblasts produced 
by the growing point in the centre of the cup and FALKENBERG therefore suggests 
“dass hier eine verkümmerte und verkannte oder normale Achselspross-Bildung 
vorliegt”. The development of the antheridia has been recently described by Kyrın. 
The procarps arise as in the other Rhodomelace® from the second segment of 
