4 04 Transaction s . — Botany. 



3. Antithamnion ptilota, Harv.-Gibs. (= Cattithamnion ptilota, 



Hook, and Harv., London Journal, iv., p. 272). 



Frond somewhat rigid, setaceous, with rather erect very 

 densely branched pinnate filaments, the pinnae nearly distichous, 

 veined, with opposite pinnules. Pinnules simple, patent, subu- 

 late. Tetraspores sparingly on the pinnules. Cystocarps and 

 antheridia unknown. 



Distribution. — Crozets (Harvey) : New Zealand (T. J. Parker). 



This plant is recorded from New Zealand by Professor Harvey- 

 Gibson in a paper " On some Marine Algae from New Zealand " 

 (" Journal of Botany," 1893). I have also a plant from Half- 

 moon Bay, Stewart Island, which Major Reinbold determined 

 as a young specimen of this species, but it is the same as the 

 plant determined for me by Agardh as C. pectinatum (vide 

 supra. Ptilothamnion pectinatum), and it seems to me that it 

 agrees with the description of C. pectinatum better than with 

 that of A. ptilota. Further, it has tetraspores in tetrads, and 

 according to Agardh they are cruciate in A . ptilota, but in tetrads 

 in A. pectinatum. Harvey-Gibson's plant bore tetraspores, but 

 he does not say of what sort, and I have not seen the original 

 description of Harvey's of A. ptilota. The tetraspores in A. 

 ptilota, according to the figure in the " Flora Antarctica " (tab. 

 189, fig. 1), are lateral, not terminal. Considering these differ- 

 ences, I do not think the plant determined for me by Major 

 Reinbold as J. ptilota can be assigned to that species. 



4. Antithamnion mucronatum, R. M. L. ( = ( 'allithamnion inucm- 



natum, J. Ag., Ep., vol. ii., p. 29; Harv., Phyc. Austr. Syn., 

 No. (588. ('. cruciatum, Harv. in Lond. Journ., iii., p. 449). 



Thallns 10-15 cm. high, robust, irregularly pinnately alter- 

 nately decompound, th.e whole covered with opposite di- tri- 

 or tetra-stichous patent and generally retroflexed ramuli. which 

 are much more crowded towards the apices of the stem or 

 branches. The ramuli arc compound or decompound, and pro- 

 vided usually with 4 to 6 short branchlets, and all singly or 

 doubly niucronatc. Tetraspores cruciatelv divided, secund on the 

 upper sides of the ramuli. Cystocarps and antheridia unknown. 



I have seen no specimens equalling in dimensions those 

 described from Tasmania,* which are more than 1 ft. in length. 

 Most of my specimens are tetrastichous, and distichous only 

 when young, and I have seen nothing of the woolly filaments 

 enclosing the base of the stem described by Harvey, f nor have 1 

 noticed the ocellated apex described for the younger specimens 

 by A.gardh.J However, there can be no doubt as to the authen- 



I'l. Tasm. ii. 334. f hoc. <•,/. JEpicr. Florid., p. 19. 



