Laing. — On Netv Zealand Species of Ceramiaceae. 391 



genera. This distinction, however, appears to me to exist only 

 when the two species are compared at different stages of growth. 

 Agardh thinks (Epicr. Florid., p. 69) that possibly two species 

 differing only in their vegetative characters are included in this 

 species — one closely resembling Bornetia binderiana ; and this 

 may turn out to be the case. The plant is not so common as 

 G. sonderiana, and hitherto I have only obtained comparatively 

 few specimens of it, and so am not in a position to say whether 

 it really contains more than one species or not. 



Genus 4. Pandorea (J. Agardh). 



Thallus irregularly dichotomously branched, of a single row 

 of large cells, articulate, and in all respects similar to that of 

 Griffithsia. Sporangia developed in special whorls of ramuli near 

 the end of the shoot.* The branchlets of these fertile whorls 

 are differentiated into short compound sporangia bearing ramuli, 

 and into sterile one-celled covering ramuli, which are tightly 

 locked together into a cup, enclosing the others, and reminding 

 one of the corolla of one of the higher plants. These one-celled 

 petaloid ramuli are from 30 to 40 in number. Antheridia and 

 cystocarps unknown. 



1. Pandorea traversii, J. Agardh. Plate XXVI. 



The genus is monotypic. The number of parts in the cup 

 surrounding the fertile ramuli, and the contiguity of the petaloid 

 cells, serve at once to distinguish this species from the preceding, 

 which it resembles much in other ways. It is, however, stouter, 

 shorter, and much less branched than Griffithsia antarctica. 

 Frond inclining to be erect, subfasciculate, axils of branches 

 rather acute. The cells about two or three times as long as 

 broad, and from \-% mm. in diameter. The involucral cup is 

 stuffed with very slender threads, bearing large tetraspores in 

 tetrads. Antheridia and cystocarps unknown. The plant was 

 first described by Agardh from specimens collected by Travels 

 at the Chatham Islands. 



Distribution. — Stewart Island, Taylor's Mistake, Lvall Bav 

 (Wellington), (R. M. L.) ; Chatham Islands (Travers). 



Genus 5. Pleonosporium (Naegeli). 



Thallus upright, filamentous, repeatedly alternatelv pinnately 

 branched with the pinnules decreasing in length towards the 

 apex, more rarely dichotomously branched. Branches consist- 

 ing of single rows of cells. Lower portion of the main shoot 

 sometimes coated with rootlets. The sporangia are placed on 



* Vide J. Ag., Florid. Morph., tab. i., figs. 1-8. 



