Laing. — On Neiv Zealand Species of Ceramiaceae. 403 



from 6-10 or occasionally more cells. Sometimes one row of 

 pinnules is wanting or partially wanting : this is particularly the 

 case at the apices of the thallus. Cells of rachis one and a half 

 times to twice as long as broad, and from 100-150 /a in length. 

 The pinnae are about £-§ mm. in length, though occasionally 

 they are several times that length. The cells of the pinnae are 

 three or four times as long as broad, and rounded at the apex. 

 The cells of the pinnules are about one and a half times as 

 long as broad, and the pinnules themselves about J— J mm. in 

 length. The apical cells extend slightly beyond the pinnules 

 in my specimens. In southern specimens these cells are acute, 

 but in some from Wellington they are rather obtuse. Axils 

 acute, and pinnae sometimes curved. As in the allied species, 

 the basal cell of each pinna is generally small and without pin- 

 nules. Tetraspores cruciate, probably solitary in the axils of 

 the pinnules. Antheridia unknown. Cystocarp unknown. 



Distribution. — Kiverton, St. Clair (./. C. S.) ; Green Island 

 Beach, Western Heads (Wellington), {R. M. L.). 



I have seen no type specimens of this plant, and Harvey's 

 original description is very imperfect, so that identification with 

 absolute certainty is impossible ; but this can scarcely be any- 

 thing else than Harvey's C. applicitum,, although my specimens 

 are not completely attached to the other algae on which they are 

 epiphytic. 



2. Antithamnion adnatum, R. M. L. (= Callithamnion adnatum. 

 J. Ag., de Alg. N.Z., Mar., p. 12). Plate XXXI., fig. 1. 



Thallus minute, at first creeping but afterwards nearly erect, 

 2-4 mm. in length, oppositely bi- and occasionally tri-pinnate. 

 Each cell of the frond provided with 3 or 4 pinnae (more 

 rarely 2) arranged in rows. The plant is thus largely tri- or 

 tetra-stichous. Cells of the rachis about 150-180 /x in length 

 and 50-60 //, in breadth. The pinnae are generally simple (about 

 £ mm. in length), and consist of 12 to 15 or occasionally more 

 cells, which are in length about 80-100 /x, and in breadth about 

 40-50^. A group of pinnae come off from below the apex, and 

 curving over it completely enclose it. The pinnae are more or 

 less arcuate, and the axils acute, so that their tips are generally 

 in contact with the main rachis. Pinnules short, with cells about 

 one and a half times as long as broad, or approximately square. 

 Organs of reproduction unknown. 



Distribution. — Bay of Islands {Berggren) ; Lyall Bay, Puke- 

 rua {R. M. L.) ; Riverton (J. C. S.). 



In the absence of cystocarps and tetraspores the exact posi- 

 tion of this plant is doubtful, but its vegetative structure is that 

 of Antithamnion. 



