460 Transactions. — Botany. 



the sporophyll, excepting the narrow outer margin. Cysto- 

 carps not seen. 



D. lancifolia, var. minor, n. var. 



Owing to the kindness of Mr. A. Hamilton, of Otago 

 University, I have received a few fragments of seaweed, 

 collected by him at the Macquarie Islands. Amongst these 

 is a Delesseria, which T find myself unable to distinguish 

 specifically from D. lancifolia (J. Ag., Bidr. Fl. Syst., p. 59). 

 Harvey regarded this latter plant as merely a variety of 

 D. sanguinea ; but Agardh, who has, however, only one 

 fertile specimen of the plant, considers it a distinct species. 

 My plant differs from Harvey's in being very much smaller, 

 and unbranched, and apparently, also, in bearing sori only on 

 the sporophylls. None of these points, however, may be 

 constant, and so I do not think it necessary at present to 

 describe it as a fresh species, but have assigned to it the 

 varietal name minor. 



Hah. Macquarie Islands. 



Description of variety : D. lancifolia, var. minor. Frond 

 simple, linear-lanceolate, acuminate, sinuous, stipitate, 30mm.- 

 40mni. in length, 4mm. -6mm. in breadth, with distinct midrib 

 and pinnate nerves, which extend two-thirds of the way to the 

 margin. Sporophylls similar in type to the frond, 3mm. -4mm. 

 in length, springing from both sides of the costa, solitary or 

 fascicled, stipitate and provided with a distinct midrib but 

 without lateral veins. The tetraspores are arranged longi- 

 tudinally on either side of the costa. Cystocarps not seen. 



I have deposited type specimens of the three above plants 

 in the Canterbury Museum. 



No list of Algae from Macquarie Island, has, so far as I 

 know, been published. With the plant above described, I re- 

 ceived from Mr. Hamilton a number of other specimens, most of 

 which were, however, too fragmentary for adequate determina- 

 tion. It may be of interest to note that there were amongst 

 them, in addition to the above variety, Ballia callitricha, 

 Melobesia antarctica (?), Plocamiiim, 2 sp., Polysijjhonia, sp., 

 Delesseria, sp. 



EXPLANATION OF PLATES XXVII. AND XXVIII. 

 Plate XXVII. 

 Delesseria crassinervia, Mont. (Photograph from Cliatham Island 

 specimen.) 



Plate XXVIII. 

 Fig. 1. Delesseria lancifolia, var. minor, mihi, x 4 diam. 

 Fig. 2. Delesseria linearis, mihi, x 2 diam. 

 Fig. 3. Sporophylls — 



(fl.) D. crassinervia, x 15 diam. 



(6.) D. linearis, x 15 diam. 



(c.) D. lancifolia, var. minor, x 15 diam. 



