NEW OR CRITICAL BRITISH MARINE ALG 871 
——— The tufts are Lar: _ — below, and yellowish 
or brown above. It appears to be a not uncommon species on 
our shied: and I have seen intense : British. specimens, gathered 
by Mr. E. M. Holmes, but I have no note as to the exact locality 
or = of gathering. 
. C, (Sponcomorpua) Sonperr Kiitz. Phye. germ. p. 208; Id., 
Tab, Phyo. iv. tab.79. Orkney; J. A. Polleafen. In the herbarium 
of the late Dr Pollexfen there are a couple of specimens of this 
species marked C. arcta. The fila ments, which are very much more 
robust than in any other British species belonging to the subgenus 
Prapennepht: are free, except at the base, where they are matted 
together by numerous rhizoids. The tufts have much the appear- 
ance Of the var. Vaucheriaformis of C. centralis. The cells often 
reach 200 » and more in diameter. The specimens were probably 
gathered about 1840, vs are not yrs the locality being given as 
“* Orkney,” acaba further indicatio 
18. 0. = ACROSIPHONIA ae Kjellman, Chlorophycé- 
sligtet Kenelishien p. 88, tab. Vil. mee 1-21. On the leaves of 
Basis era, Bognor, May, 1885; #.A.B Peeves May, 1899; Mrs. 
Robertson. The widely spreading, compac ct, almost membranous, 
basal layer from which the erect filaments arise render the recog- 
nition of this eben easy. 
_ 14. C. srotontrera = AcROSIPHONIA STOLONIFERA Kjellman, le. 
p. 85, tab. vi. 'Berwiee Oct. 1882. Cumbrae, Aug. 1891; FE. 4. B. 
PHHOPHYCER. 
. Myrtonema poryonapum Sauvageau in Ann. des he, 
peat Bot. 8e ser. tome v. 1898, p. 78, fig. 18. On the 
of Saccorhiza bulbosa, GWatiage. Sept. 1898; H. 4. 
1 Corunna Sauvagean, /.c. p. 77, fig. 14. On the blade 
of Laminaria saccharina, Cumbrae, Aug. 1891, gee ee 4 Sept. 
8; EH. A. B. 
17. M. parmiosum Sauvageau, /.c. p. 82, figs. 15-17. On the 
blade of L. saccharina and I.. divisatés, “Weyriwuth; Sept. 1892, and 
Swanage, Sept. 1898, H. A. B. 
18. Myrionema ? saxrcora Kuckuck, Bemerk. mar. algenvegetat 
von Helgoland, ii. p. 881, fig. 8. On yooks near high-water mark, 
and on Hot gate ane in company with Isactis plana, Swanage, Rept. 
1898 ; 
19. Hx ECATONEMA MacuLANS Sauy. l.c. p. 88, ae 18-22. On 
Corallina officinalis. Peveril Point, Sw wanage, Sept. 18 
Rhodymenia palmata and L. saccharina, Swanage, Sept. 1897 ; 
EL. A. B. 
20. Cumionema Narnatim Sauyv. /.c¢. p- asi figs. 23-24. ( 
Rhodymenia palmata, Swanage, Sept. 1898, EF. 4. B. This species 
is ecient y found wing in company with Gidiinams ocellatum 
Sauv. (= Ascocyclus ocellatus Reinke), to which it apne ars to be 
united by many intermediate forms. Many, if not all, ok the 
specimens referred by Mrs. Griffiths and Harvey yt Be ae 
