432 Dr. Greville on some new species of Sargassum. 



ricis, petiolatis, petiolis brevibus, planis, dilatatis ; recej taculis 

 compressis, subcuneatis, racemosis, ad apicem late denticulatis. 

 Hab. in mari Peninsula? India? Orientalis ; Wight. 



Root I have not seen. Stem probably 1-2 feet long, an- 

 gular, and nearly as thick as a crow-quill ; in the portion which 

 I possess, giving off branches at intervals of half an inch ; these 

 branches towards the base are 4-6 inches long, spreading, be- 

 coming gradually shorter upwards, so as to render the general 

 outline pyramidal ; all of them thickly clothed with ramuli about 

 an inch in length, and bushy with leaves, vesicles and receptacles. 

 Leaves shortly petiolate, about an inch long, very numerous, lan- 

 ceolate or linear-lanceolate, somewhat acute, repando-denticulate, 

 furnished with scattered pores and a strong nerve which disap- 

 pears below the apex. Vesicles intermixed with the receptacles, 

 about the size of hemp-seed, spherical, often slightly margined, 

 supported on dilated foliaceous stalks seldom much more than a 

 line in length, but occasionally on stalks a quarter of an inch 

 long, more broadly foliaceous and nerved. Receptacles axillary, a 

 line or a line and a half long, forming minute more or less divided 

 clusters ; they are linear-cuneate, subcylindrical at the base, com- 

 pressed upwards, and furnished with broad, sharp teeth at the 

 sides and apex. Colour very dark red-brown. Substance when 

 dry somewhat firm, cartilaginous and opake. 



This species has so great a resemblance at first sight to another, 

 which I received from Dr. Wight, and which stands in the her- 

 barium as my No. 7, that they were mixed together, and it was 

 not until I examined them critically that they were perceived to 

 be essentially distinct. Of the present species I only possess a 

 solitary specimen, and that not an entire one, there being only 

 about twelve inches of the upper extremity ; at the same time it 

 is in so satisfactory a state, that I venture with some confidence 

 to regard it as undescribed. 



8. Sargassum acanthicarpum (nob.) ; caule elongato, filiformi, sub- 

 angulato, ramosissimo ; foliis lineari-lanceolatis, uninervibus, pro- 

 funde dentato-serratis ; vesiculis subspha?ricis, petiolatis, planis, 

 dilatatis ; receptaculis axillaribus, racemosis, compressis, lineari- 

 cuneatis, grosse et acute dentatis. 



Wight in herb. no. 4 & 6. 



Hab. in mari Peninsula? India? Orientalis ; Wight. 



Entire plant near 2 feet long, with a slender graceful ap- 

 pearance. Root a small callous disc, from which arise one or 

 more undivided somewhat angular stems, not thicker than a 

 sparrow's quill. The branches begin to be given off in a hori- 

 zontal manner immediately above the root, where they are 2 or 

 3 inches long, soon extending to 5 or 6 inches, and then gra- 

 dually diminishing to the end, thus giving the whole a more or 



