116 
NEW OR CRITICAL BRITISH ALGA2. 
collabens of Kiitzing are referable to Urospora bangioides , Holmes 
and Batters, and that the H. bangioides , Kutz., is a synonym of U, 
isogona. 
Urospora collabens seems to be more nearly related to U . 
Wormskioldii, Rosenv., than to either U. isogona or U. bangioides ; 
indeed, Rosenvinge’s figures (Gronl. Hay. Alg., p. 921) of Z7. 
Woi'mskioldii might have been drawn from a fertile thread of the 
Cumbrae plant. It is not improbable, therefore, that U. collabens 
is only a form of the Greenland plant. 
With regard to Urospora isogona, I would note that although 
there may be some doubts as to whether Areschoug’s U. mirabilis 
is the same plant as Roth’s Conferva penicilliformis, there can be 
none as to its being the Conferva isogona of English Botany, tab. 
1930, authentic specimens of which are still in existence ; the 
specific name isogona must therefore be retained. 
Ectocarpus luteolus, Sauvageau, Journal de Botanique, Vol. vi. (1892), 
p. 89 t. II., fig. 14-19. 
Mr. T. H. Buffham has kindly sent us specimens of this species, 
a short account of which will be found in a former number of this 
Journal (Grevillea, No. 98, p. 56), gathered at Brighton in March, 
1894 ; we have also seen specimens from Weymouth and 
Swan age. 
Giffordia fenestrata, Bait., Grevillea, Vol. xxi., p. 86. 
We have received from Mr. Buffham some beautiful specimens 
of an Ectocarpus , which appears to be identical with Berkeley’s 
Ect. fenestratus. It was gathered at Bude in September, 1893, 
growing in loose tufts on Ascophyllum nodosum . Although 
undoubtedly closely related to G. Lebelii, it differs from that 
species in several respects, more especially in the absence of the 
elachista-like habit and the zone of short deeply-coloured cells, 
succeeded by longer, very faintly-coloured ones, so characteristic 
of that species. 
We must congratulate Mr. G. Brebner on his fortunate dis- 
covery of Scapho spora speciosa on the shores of Britain. He has 
most kindly placed the following interesting note on the species at 
our disposal : — 
Scaphospora speciosa, Kjellm., Algenv. Mur. Meer., p. 29. 
This plant was found on a stone which had been taken at low 
water from the shelving shore near the Lion Rock, Cumbrae, on 
the 21st March, 1894. The three genera of the Tilopteridce — 
Tilopteris, Haplospora, Scaphospora — are thus found to be repre- 
sented in British waters, as was expected by our ajgological 
experts, vide note on Haplospora globosa , by Mr. Batters, in 
Grevillea, June, 1893. The two specimens obtained were 
small, not longer than lin., but the ultimate ramifications were 
literally covered with the characteristic reproductive organs, 
antheridia, and large uni-nucleate sporangia, or “ zoosporangia ” 
and oosporangia ” respectively. The plants differed but little 
