NITOPHYLLUM. 117 



D. Moore, at Cushendall Bay, North of Ireland, 5 feet long and 3 feet 

 wide ! In some specimens the frond is nearly simple, with a few dichoto- 

 mous lobes near the apex ; in others it is once or twice forked, with the 

 margin fringed with dichotomous lobes; and in others the whole frond is 

 repeatedly and regularly dichotomous, the segments narrow and linear. 

 This last state constitutes the N. ocellatum of authors, a plant which, in its 

 typical form, appears distinct enough ; but numerous specimens, kindly 

 communicated to me by Mrs. Griffiths, exhibit such intermediate charac- 

 ters, that I no longer hesitate to unite it with N. punctatum : with which 

 opinion, I am happy to add, Dr. Greville and Mrs. Griffiths coincide. In 

 all its varieties the frond of this species is exceedingly thin and delicate, 

 quite destitute of veins. The tubercles are globose, and thickly scattered 

 over the surface ; the spots of tetraspores large, 1 or 2 lines long, oblong, 

 oval or linear, scattered over the whole surface or confined to a central por- 

 tion of the frond. 



2. N. HillicB, Grev. ; frond thiclush, but tender, faintly 

 veined towards the base, roundish, but very irregular in figure, 

 somewhat cuneate at base, variously cleft into oblong, more 

 or less broad, rounded segments ; spots of tetraspores very 

 minute, scattered over nearly the whole frond. Grev. Alg. 

 Brit. p. 80 ; Ham. Phyc. Brit. t. clxix. N. ulvoideum, Harv. 

 Man. 1st edit. p. 57 ; 'Hook. Br. Fl. ii. p. 287 ; Wyatt, Alg. 

 Danm. No. 16. Del. Hilli<e, Grev. Crypt, t. 351. Fucus 

 ulvoides, Turn. Hist. t. 80, (see Hook). 



On rocks, &c. near low-water mark ; rare. Annual. July to October. 

 South of England and Ireland, first found by the late Miss Hill, at Ply- 

 mouth. Frond 4 8 inches long, broadly flabelliform, slightly dichoto- 

 mously cleft or lobed, the margin smooth and even, rising from a short, 

 cartilaginous stem, obscurely veined at the base, and sometimes over the 

 surface, of a thickish membranaceous substance " resembling soft kid-lea- 

 ther " (Mrs. Griffiths), and fine, rose-red colour, which becomes orange in 

 fresh water. Tubercles large, globose, scattered over the surface ; spots of 

 tetraspores extremely minute, dot-like, abundantly scattered over the upper 

 part of the lobes. Smell, when fresh, extremely disagreeable and peculiar. 

 This species is well marked by its thick substance and the minute size of 

 the spots of granules. 



3. N. Bonnemaisoni, Ag. ; frond shortly stalked, flabel- 

 late or palmate, variously cleft into numerous wedge-shaped 

 segments, furnished near the base with irregular vanishing 

 nerves; spots of tetraspores roundish, scattered over the 

 frond. Hook. Br. Fl. ii. p. 287. Del. Bonnemaisoni, Grev. 

 Crypt, t. 322. 



On the stems of Larninaria digitata ; rare. Annual. Summer. Ork- 

 ney, Rev. Mr. Clouston. Bute, Dr. Greville. Larne, Dr. Drummond. 

 Youghal, Miss Ball. Torquay and Ilfracombe, Mrs. Griffiths. Tramore, 

 Miss Taylor. Miltown Malbay. Frond with a short, cartilaginous stem, 

 broadly fan-shaped, 2 4 inches long and about as broad, more or less 

 deeply cleft in a dichotomous manner, the segments broadly wedge-shaped, 



