MR. 6. MURRAY ON NEW SPECIES ОЕ CAULERPA, 209 
further relationship this connection implies, In a paper read before this Society on 
Boodlea, then a new genus of Siphonocladacee (Linn. Soc. Journ., Bot. vol. xxv. p. 243), I 
endeavoured to establish a connection of this group through Boodlea with M: icrodictyon &c., 
and with the jointed green Algæ (Cladophora, е. g.) through Spongocladia. Mrs. Weber 
van Bosse has since then, by her admirable research on Spongocladia and Struvea (Апп. 
Jard. Bot. Buitenzorg, vol. viii. (1889-90) p. 79), made this connection even closer, 
and what I then claimed to establish has since been accepted by Continental and 
other phycologists who have worked at this group. I refer to the matter now, not 
only in view of the subject of this paper, but to bring forward incidentally one more 
proof of this connection—which bears upon my argument directly. Mr. Holmes 
has furnished me with a specimen of Cladophora rugulosa, Martens, also from the 
Cape of Good Hope, which possesses such a rugose basal cell, from which the frond 
filaments arise in dichotomous series. 
A closer examination of this species discloses the fact that not only is the basal cell 
elongated and entirely aseptate, but it is similarly thickened, though more slightly. 
Besides the basal cell, the basal portions of the upper joints are all similarly rugose, 
and the whole structure and appearance of the plant so strongly correspond with 
Harvey’s genus Apjohnia that I have no hesitation in transferring Cladophora rugulosa 
to Apjohnia—as Apjohnia rugulosa. It is of equal height with the already existing 
Apjohnia lete-virens, Harv., but the filaments are much more slender, and the habit of 
the plant is therefore like that of Cladophora. А minute study of the development of 
the branches in these Valoniaceous genera, especially in Apjohnia, is much to be 
desired. This species (4. rugulosa) is move accessible at the Cape than 4. lete-virens 
appears to be, and we may therefore hope for light on the subject. In founding the 
genus, Harvey (Phyc. Austr. tab. v.) says: “At first sight the plant here figured (viz. 
А. lete-virens) may pass for a very robust species of Cladophora, of the division to 
which С. pellucida belongs. But a closer examination reveals characters which force us 
to remove it far from Cladophora, and to associate it with the small group of confervoid 
. Algze which is typified by Valonia. These characters are—the branching fibrils, that 
issue from the base of the first-formed cell; the annular constrictions of the cells, both 
primary and those afterwards formed; the deposition of carbonate of lime, as a 
superficial coating; the watery contents of the cells; and, finally, the mode of develop- 
ment.” With regard to the last of these characters, it is, as I have said, desirable that 
we should know more than Harvey has been able to tell us. As for the coating of 
carbonate of lime in Apjohnia, as in Struvea and in Chamedoris, this is produced by the 
growth of incrusting Coralline ; and іп point of the other characters 4. rugulosa 
closely corresponds in all respects (see fig. 5). I have no doubt of the identity of the 
plant given to me by Mr. Holmes with Martens’s species, having compared it with his 
figure and description in ‘ Die Preussische Expedition nach Ost-Asien,’ Botan. Theil, 
‚р. 112, tab. ii. fig. 3, where Martens tells us that it had been collected by Dr. Krauss at 
Port Natal, as well as at Yokohama. Mr. Holmes’s specimen comes from Algoa Bay, 
where it was collected by Mr. Becker. 
This character of annulate constrictions is, then, of frequent occurrence among 
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