ee 
the figures of Melobesia Corallinæ Crovan (l. c.). These specimens have not been 
examined by FosLie, but as this author regarded Crouan’s species as being only 
a form of Lithophyllum pustulatum, he would 
probably have referred our plant “as a de- 
nominated form” to L. macrocarpum, whereas 
it has disporic sporangia. A closer exami- 
nation of my specimens, some of which 
were preserved in alcohol, showed me, 
however, such differences from the named 
species that they cannot, in my opinion, 
be referred to it, but must be regarded as 
representing a different species bearing 
CROUAN's name. 
The crust is in some cases surround- 
ing the Corallina-frond, being attached to 
it in its whole extent and fusing together 
where the borders meet. In other cases it Fig. 186. _ 
is only attached by its central thicker Bee ee cage af Ge à Gane eee 
portion, while the thinner edges) of the or of frond nearly conceplacle i330 LÆGES CHonkot 
; frond with sporangial conceptacle. 65:1. 
bieular, peltate frond are free (fig. 187, comp. 
+. Crouan, 1. c. fig. 6,7). In the first case the 
De et frond was up to 105 (over 12 cells) thick, 
WAL aaa NE in the latter the central part was about 
NC 350 4 thick, the inner edge 70—105 2 thick. 
The diameter of the peltate fronds is 2—2,5 
mm. The edge of the frond is thick, poly- 
stromatic to the very margin or nearly so, 
the cells cut off from the marginal cell 
dividing early by transversal walls. The 
marginal cell is much smaller than in 
L. macrocarpum (fig. 186 A). The under- 
most cell in the vertical or ascending cell- 
rows constituting the frond is not longer 
than the others, frequently even shorter, 
being only 1—3 times as long as broad; 
these cells are usually inclined. The cells 
of the upper cell-layers are frequently 
much longer; the transversal pits of these 
cells are always distinct; they are shown 
VA 
Fig. 187. 
Lithophyllum Coralline, from Hanstholm, vertical sec- ın fig. 186. 
tions of seutate fronds with free edges. Sporangial The sporangial conceptacles are only 
conceptacles in À and C, cystocarpic conceptacles in i i : = 
B. Overgrown conceptacles in B and C. 65:1. little prominent, forming low warts with 
