218 
that the sporangia in such cases were not quite ripe, and would later on have been 
divided into four spores, but as in other cases the divisions have shown to be al- 
most simultaneous (fig. 134 C) it 
seems most probable that disporic 
sporangia occur besides tetrasporic 
ones, as in several other species. 
Sporangia with 4 spores found in 
the Limfjord and in the Kattegat were 
100—112y long, 34—48 » broad; in 
specimens collected in Bramsnes Vig 
(Ise Fjord) they were only 53—91 » 
long, 14—25 broad. 
Antheridial conceptacles were 
found in specimens from Staffans 
Fig. 134. Flak in the Sound and from Brams- 
Lithothamnion Lenormandi. A, vertical section of crust with pees Fjord. In both cases they were 
sporangial conceptacles. B, tetrasporangium in two consecutive = £ à 
sections. C, tetrasporangium in three consecutive sections. 300—350 u in diameter, thus much 
AGE Bas larger than stated by FosrıE (150 
—200 ). In the specimens from the first named locality collected in September 
they were fully developed and showed a rather complicated structure, the spermatia 
being produced on the ultimate ramifications of dendroid systems of filaments given 
off from several points of the inner surface of the conceptacle, from the bottom 
and from the upper side as well (Plate III fig. 2). The structure of the antheridial 
conceptacles is thus rather similar to those of Lith. polymorphum described by 
HEyprıcr (Lith. Helg. p. 65, Taf. II fig. 1-3). The dimensions of the spermatia 
seem to be 3x4». 
The cystocarpic concep- 
tacles are hemispheric to coni- 
cal, 320—350 » in diameter. 
It is remarkable that the car- 
pospores are not only produ- À 
ced at the periphery of the bot- / 
tom of the conceptacle but from 
the whole face of the floor, a fact 
by which our species differs, as BEA 
it appears, from the type not 
only of the genus but also of the 
family. The carpospores are 
50—63 » long, 21—32 4 broad’. 
1 HeypricH has in 1911 (1. c.) 
established a new genus. Squamolithon, 
Fig. 135. 
É: = Lithothamnion Lenormandi. Vertical section of cystocarpic 
founded on Lithothamnion Lenormandi, conceptacle. 200:1. 
