198 
broader stalk-cell. In some specimens from the Little Belt (Middelfart) the paraphyses 
were but few in number, in some cases almost wanting; the plant had then a cer- 
tain resemblance with Rhododiscus pulcherrimus. 
The sporangia are first divided by a transverse wall; the vertical walls occur 
at a later moment, for which reason sori containing only bipartite and undivided 
sporangia are not infrequently met with (comp. Kuckuck 1. c. p. 7 and Barrers |. c. 
pl. XI fig. 1a). The ripe sporangia are usually 24—33 y long, 16—20(24) » broad. 
|) 
WG 
5 C 
Nb 
N 
OOA] 
5000 250 
Os 000 ? 
Fig. 118. 
Rhododermis elegans. A, marginal part of frond seen from above. B, basal layer of fructifying frond seen from 
below. C, vertical section of fertile part of frond with paraphyses, a bipartite sporangium and a hyaline hair. D, 
vertical section of frond with sorus; sporangia bipartite. E, almost globular ripe sporangium from Hornenæs. 
F, ripe sporangium. G, regeneration of sporangium. 385:1. 
The greatest sporangium was found in a specimen from Refsnes; it measured 33 a 
in length and 24 » in breadth. In the southernmost place in the Danish waters 
(at Hornenæs in the Little Belt) I found almost globular sporangia, 20—21 y long, 184 
broad (fig. 118 E). After evacuation a new sporangium may be produced from the 
stalk-cell within the empty sporangium wall (fig. 118 G). 
Sexual organs were not met with. Antheridia are only known in specimens 
from North-East Greenland (K. Rosenvinge 1910). 
As to the time of fructification only incomplete information can be given. In 
winter (October to February) the species has not been met with, but it must be 
supposed from observations from the coasts of England and of Greenland, that it 
will be found fructifying in winter with us, and this supposition is in accordance 
