242 
usually no such formation was to be seen. The sporangia are, when fully devel- 
oped, four-parted, 45—77 » long, 32—49 » broad. While at first vertically placed, 
they may sometimes finally become horizontal, at all events when the conceptacle 
contains only one or two developed sporangia (fig. 158 D—E). 
The antheridial conceptacles are small, often very small, and but little pro- 
minent if at all. As shown by Mrs. WEBER-VAN BOSSE (I. c.), the spermatia are 
produced at the end of long sterigmata developed from a layer of very small cells 
covering the basal layer (fig. 159 A, C). In some cases, however, the cells producing 
the sterigmata are 
not placed di- 
SS ES rectly on the ba- 
lea Pl sal layer (fig. 158 
| WA | | 
LMI spre | B, C). In some 
cases the concep- 
tacle was found 
provided with a 
long slightly cur- 
ved spout agree- 
ing exactly with 
that described by 
Mrs. WEBER (fig. 
158 C); but in 
most cases no 
Melobesia Lejolisi. A and B from Holbæk Fjord, A, antheridial conceptacle. B, female such spout Was 
conceptacle, showing carpogonia. C, antheridial conceptacle. D, cystocarpic conceptacle, to be seen. The 
C 650 :1, the rest 350: 1. 
ostiole was then 
a simple small hole without any peristome. The spermatia appeared sometimes as 
slightly elongated ceils with pointed ends (fig. 159 C). 
Well developed female conceptacles were only rarely found. The conceptacles 
shown in figs. 157 B and 159 B are certainly female ones, containing unfertilized 
carpogonia, and fig. 159 D represents a cystocarpic conceptacle with the carpospores 
placed at the periphery only. A disc-cell could not be distinguished. Peristomial 
hairs seem not to be developed. The diameter of female conceptacles was found 
to be 123—175 ». 
Ripe tetrasporangia have been found in summer (June to September), anthe- 
ridia in May and September, and cystocarps (with few spores) in May. 
I have referred to this species all the specimens growing on old Zostera-leaves 
and referred by FosrıE to M. Lejolisii f. typica, with the exception of one sample 
mentioned below under M. subplana. The species has also been found growing on 
Ruppia. The specimens growing on Algz, on the other hand, seem to belong to 
other species, which are mentioned below. The species has been found in depths 
of 1—11 meters. 
