are 
TWO NEW BRITISH ECTOCARPI. 
By E. M. Hotes, F.L.S. 
‘(Puate 274). 
THE. two species of this s very difficult genus, “which are here 
noticed, have been selected for illustration simply because figures 
of them do not appear to have been hitherto publishe The 
additions that have been made to the British species of the genus 
during the last few years include eight or nine others, but of all 
of these illustrations haye been given in various algological works. 
Ecrocarrus stupLex. Crouan.—This is described by Crouan as 
growing in tufts of about a centimetre in extent, furnished with few 
alternate ramuli, which, however, are sometimes opposite or on the 
same side, the articulation being one-half to three times as long as 
broad, but those bearing sporangia are as long as broad. The 
sporangia are conical, obtuse, stalked, 73 a over the frond.* 
eet 6) ctocarpus = - i Lloyd, Alg. 
Exs Desmaz. ; Crouan, ys Mar. Finist. 18 ; Le Jolis, 
Alg. Cherb. _ Lloyd, yee Ouest. 332 : Holmes, Alg. Brit. rar. 8. 
This species I have only found growing on Codium tomentosum, 
in small shad pools . mid-tide or close to low-water marl 
yet I have met with it in June only at the Lizard, and Peverel 
Point, Swanage, but it will doubtless be found elsewhere. The 
being re ibe talked. The tufts are of a dark brown colour, and 
appear oe imi with rooting-threads, which enter the fronds 
of the C 
“hag aRpuS instants Crouan.—The description given by Crouan 
is a 3:—Frond branching from the base, ramuli subhori- 
s follow 
siete: divaricate, eae or opposite, the lower third of the tuft 
being covered with numerous ovoid sessile sporangia, which give to 
this portion of the plant a darker colour. The lower jo ate are 
tufts are usually a pale dirty brown colour. On Chondria 
See EEE 
ow fag. 1¢ a ihe extent of variation in shape, when compared with the 
aes shown 
NAL OF peter 25. (JunE, 1887.] M 
