268 
The cystocarpic conceptacles have the same shape and size as the sporangial 
ones. The papillæ lining the ostiole were found more developed than in the spor- 
angial conceptacles. The structure of the cyslocarp rather resembles that of Corallina, 
a large disc-shaped cell occupying 
the bottom of the conceptacle 
giving off at the periphery seriate 
carpospores and covered with 
numerous closely placed oblong 
cells filled with protoplasmatic 
contents, the morphological char- 
acter of which could not be de- 
termined, as trichogynes were 
in no cases observed (fig. 190). 
The cystocarpic conceptacles 
Fig. 190. become overgrown and sunk in 
Lithophyllum Coralline. Vertical section of eystocarpie conceptacle. the crust as also the sporangial 
350:1. 
conceptacles. 
The structure of the frond, being polystromatic to the margin, and the slightly 
prominent conceptacles being sometimes overgrown and deeply sunk in the frond, 
are the principal characters distinguishing this species from the foregoing, with 
which it agrees in its disporic, though smaller sporangia. It is apparently not 
identical with Melobesia Corallinæ Sorms (Corall. p. 9, Taf. II, fig. 25, III fig. 21—24) 
which differs, to judge from the figures, by tetrasporie sporangia, occupying the 
central part of the conceptacle, by the want of columella, and apparently by the 
structure of the frond, the basal cell-layer being very low. 
Found with sporangia and cystocarps in July and August. 
Localities. Sk: YT, YU, Hanstholm, 2--6 meters; Hirshals. on the mole. 
4. Lithophyllum pustulatum 
(Lamour.) Foslie forma? 
Mention may be made here of an alga 
recorded once growing on Corallina offici- 
nalis but which could not be identified ke NY, 
with certainty on account of the incomplete eS Wee TC = 
state of the present material. It forms thin AN WE 
red crusts, the peripheral part of which is PERS, X DOOR 4 
monostromatic with cortical cells, only XD” 
14—20 „ thick, while the central portion, oO 
consisting of 2—3 cell-layers, besides the Fig. 191. 
Lithophyllum pustulatum forma?. Vertical section of 
cortical cells, has a thickness of up to 80 y. One half of an empty conceptacle. 205-10 
allel 
