Clare Island Survey — Marine Algae. 15 177 



Fig. 2. — " Fucus farm " in Achill Sound. Photograpli of Blind Sound 

 (near Darby's Point) at low-water, showing stones with growth of Fucus. The 

 stones are set out (often in regular rows) by the cottagers, and become rapidly 

 colonized by Fucus vesiculosa, which, at the end of the second season, is cut 

 for use as manure. 



Plate VI. 



Fucus vesiculosa s var. muscoidcs var. nov. 



Fig. 1. — Dried specimens of individual plants (slightly less than natural 

 size). The specimens in the two upper rows are from the dense mossy growth 

 seen in fig. 2; those from the lower are from the margins of such growth, 

 where increased space and moisture allow of better development, in the 

 lowermost specimen to the right two male receptacles are recognisable. 



Fig 2. — Small piece cut out from var. muscoides sward in Achill Sound. 

 The sward forms a narrow irregular zone in several parts of the Sound. It is 

 more or less mixed with Statice maritima, Glyceria maridma, Salicornia 

 spp., etc., and in the month of May is particularly attractive, owing to the 

 bright pink flowers of the first-named. Photo by Mr. G. Massee of tuft 

 brought back to Kew (slightly reduced). 



Plate VII. 



Codium mucronatum var. atlanticum var. nov., with a fragment of 

 C. tomcntosum (nat. size). The drawings are made from dried specimens ; 

 but the thick branches and robust habit of C. mucronatum are noticeable. In 

 the living state the plants can readily be distinguished by this character ; but 

 in dried specimens it is necessary to examine the utricles. 



Plate VIII. 

 Utricles of Codium mucronatum and C. tomcntosum. 



1-2. C. tomcntosum. Showing short utricles with the cell- wall thickened at 



the apex. (Clare Island, Oct., 1910.) 

 o. C. mucronatum var. atlanticum var. nov. Showing utricles double the 



length of those of C. tomcntosum, and considerably wider ; apex even 



or mucronate ; not thickened as in C. tomcntosum. (Giant's Causeway, 



May, 1910.) 



4. C. mucronatum var. atlanticum var. nov. Xote drumstick utricle 



specially frequent in old plants. (Clare Island, April, 1909.) 



5. C. mucronatum var. atlanticum var. nov., with gametangia ( $ ). (Koonah 



Quay, June, 1910.) 



R.I. A. PROC, VOL. XXXI. Z 15 



