Fig. 333. 
Rhodochorton membrana- 
ceum. Living cell showing 
chromatophores and nu- 
cleus (nj. 675 : 1. 
thick, frequently 
extremely short 
and unbranched, AN 
. . SRE 
consisting of one = 
N 
or a small num- 5 
ber of short cells EN: SRE FE CRD 
£ Øg Rhodochorton membranaceum. Fromthe North  Rhodochorton membranaceum, grow- 
and terminating Sea, aF, growing in Abietaria abietina. A, port- ing in Abietaria abietina off Refsnæs. 
with a sporangium. ion of basal layer with a fertile branch: B; sect- A, free filament with sporangia. Band 
ion of the wall of Abietaria showing the intra- C, cells showing chromatophores. A 
Or they may be matrical growth of the Rhodochorton. 390 : 1. 230 : 1. B, C 625: 1. 
branched, but the 
primary filament then always bears a terminal sporangium, and the branches also 
end with a sporangium (fig. 334, comp. Kuckuck, I. c. p. 16—17, fig. 2). The free 
filaments may behave in the same manner when the species is growing in other 
Hydroids; but in the plants infesting Abietaria abietina, the free filaments are 
sometimes much longer, ending in a long sterile apical cell, while the sporangia 
are terminal on short lateral branches or sometimes also on branches of the 
second order. Kuckuck has described such specimens found growing in the same 
Hydroid (1. c. p. 17—19, fig. 3); he concludes, in accordance with me, that they 
must be referred to Rhodochorton membranaceum, not to a special form of it. Hav- 
ing found similar specimens in an Abietaria abielina dredged at PF off Refsnæs 
(Sa)! (fig. 335), I have recently been in doubt. The sum of characters found in 
! Similar specimens have been recently found in cL, N.E. of Sprogø. 
