212 MR. G. MURRAY AND MISS E. S. BARTON ON THE 
to about twice the diameter. The cell-walls are thinner in the 
apical than in the basal cells. The filaments are attached to the 
Lemanea by means of non-septate and much-coiled rhizoids. 
Sessile monospores are borne in great abundance on the branch- 
lets generally opposite in twos, often in threes. Such clusters 
occur at the ends of the branches, sometimes with the terminal 
hyaline hair, sometimes without it. They are rather pyriform 
than oval in shape, and of a deeper colour owing to denser 
contents than the cells of the filaments. When the branches 
are in full-bearing, monospores terminate nearly every twig aud 
the hyaline hairs are only rarely to be met with (Plate XX XVI. 
fig. 1). 
We have not been able to observe the escape of these mono- 
spores, since the material was preserved in alcohol before the mi- 
croscopic examination took place. They are, however, not simply 
detached, since after the escape there remain the empty spore- 
cases in situ (figs. 4 and 5). This spore-case or outer wall is 
apiculate and hyaline, while the inner one is darker in colour. 
From the fact that traces of empty spore-cases sometimes 
appear round the base of monospores, it would appear that new 
outgrowths occur through these old spore-cases (figs. 4 and 5), 
as in the unilocular sporanges of Cladostephus. We must regard 
these monospores as produced in monosporanges (=spore-cases), 
the homologues of the tetrasporanges of other Floride: *. 
The above description represents the usual appearance of the 
plant as collected. Patient examination of it, however, was 
rewarded by other discoveries, viz. antherids, trichogynes, and 
eystocarps. The antherids (Pl. XX XVII. fig. 4) resemble, as will 
be seen by the figures, most closely those of Oh. corymbifera ; 
they form dense clusters, and each pollinoid is about two-thirds 
the diameter of the adjacent filament in size. The cystocarps 
(Pl. XXXVII. figs. 2 and 3) form corymbose stalked clusters of 
carpospores which are in size about twice the diameter of the 
filaments which bear them. It will be seen from the illus- 
* As further confirming this view, it may be added that, in the course of ob- 
servations on a marine species, Chantransia secundata, we have observed its early 
stages of germination on Cladophora rupestris. The monospore first divides 
into four, and then so closely resembles a tetraspore that the acceptance of this 
view as to its homology becomes irresistible (Pl. XXXVII. fig. 5). This division 
then proceeds in the same plane, thus giving rise to the membranous base of 
Chantransia, from which the upright filaments arise. 
