231 
wall between the two cells is more or less oblique, but a hypogynous cell is not cut 
off from the lowermost end of the carpogonium as in Choreonema. I have not been 
able to follow the development of the carpogonia after fertilization, but it must be 
said that there is nothing to support the supposition of Hryprica that each auxiliary 
cell becomes a carpospore. The only thing which might favour this view is the 
fact that the carpospores are produced not only at the periphery but also from the 
central part of the floor of the conceptacle, as shown by HeypricH (I. c. fig. 12), 
and as I have also observed it (fig. 149). But the carpospores do not arise singly; 
they are produced in short rows, as shown by earlier authors (SoLMS, PILGER, 
MINDER) for other 
Corallinaceæ. This 
is shown in fig. 
149 where a smal- 
ler (younger) car- 
pospore is situated 
under the most 
developed ones; 
they have undoub- 
tedly been produ- 
ced successively 
by the sporophyte, 
but the behaviour 
of the latter could Fig. 149. 
not be stated. The Lithothamnion polymorphum, vertical sections of eystocarpie conceptacles with carpo- 
spores. A 200.1. B 350:1. 
low cells visible 
under the youngest carpospores are probably parts of the sporophyte (or of the fu- 
sion cell, if Sozms’ view is correct); or might there perhaps be more than one 
sporophyte? The cells situated below the procarps may show lateral fusions (fig. 
148 D), but it is doubtful whether these fusions have any relations to those of the 
sporophyte with the auxiliary cells. The evacuated cystocarpic conceptacles remain 
empty, or become partly filled with regenerating tissue produced from above. 
As mentioned above, this species grows particularly on large boulders; it is 
therefore probably much commoner than might be supposed from the localities 
given below, while it does not always become loosened from the stone by the dredge. 
It occurs in all the three forms quoted by Fostie which however, as stated by this 
author, are “not well defined, as transitions often appear to occur”. It seems to 
be rather common in the Danish waters to the limits of the Baltic Sea, with the 
exception of the Limfjord and other fjords where it is wanling. It seems most 
common in the Kattegat. It occurs in depths of 2 to 19 meters. Tetrasporangia 
have been met with in April, carpogonia in January and May, and carpospores in May. 
Localities. Sk: ZK" off Lønstrup, 11,3 m; off Hirshals, 11—15 m. — Kn: TX, north of Græs- 
holm (Hirsholmene); on stones picked up by Hirsholmene, about 4,5 m, large crusts; east of Deget; off 
