SOMERSET MARINE ALG.E. 271 



yeininw; and under the microscope by the larger size of the cellules. Nito- 

 phyllum Bonnemaisoni is frequently found in fruit, and its habitat is on the 

 stems of Lahiinaria dujitata. 



In the beginning of August, 1848, I was so fortunate as to meet with 

 the Stenogramme interrupta, one of our rarest sea-weeds, which had been dis- 

 covered in November of the previous year, on the shores near Plymouth, by the 

 Eev. W. S. Hore, and Dr. John Cocks; its only other known station then was 

 at Cadiz; but it is now found to be a native also of the shores of New Zealand. 

 The primary fruit is contained in a raised line, which traverses the centre of 

 each division of the frond, and when this is present it is easy to recognise the 

 plant; the secondary fruit, consisting of tetraspores, forms roundish dots on 

 the frond: these I first discovered on Minehead specimens, and plants with this 

 description of fruit have not been found at Plymouth, nor, I am informed, has 

 a scrap of the plant been met with for two seasons there. This species inhabits 

 deep water. One single plant, with tetraspores, has been obtained by the 

 dredge in Cork harbour by Mr. CaroU.""- On Minehead beach the young 

 plants are to be found in June; and in the following November and December 

 they attain to their full growth. Collectors who may visit the opposite shores 

 of Wales will do well to look for this and other species herein noticed. 



On the Somerset coast I have enumerated eighty different species of Marine 

 Algae;f nearly one-half of these may be collected in their customary places 

 of growth — on rocks, stones, etc., and in pools left at ebb tide; probably 

 were the dredge employed, many more kinds might be discovered; and spec- 

 imens thus obtained are generally in a state of much better preservation 

 than those floated ashore after being battered about by the waves. Grate- 

 loupia fdicina, a rare species, grows on the beach at Minehead; and, with 

 the exception of Aberyswith, this is the northernmost limit for the plant in 

 Britain. 



Geramium Jiahellijerum, which I find growing at Blue Anchor, and on 

 wood-work in the sea at Minehead, though marked as "rare" in the works 

 of Professor Harvey, will, I think, prove to be very generally distributed on 

 the shores of the British Isles. I have received specimens of it from many 

 difierent localities. By the naked eye it is scarcely to be discriminated from 

 the common Geramium i^nhrum, but the colour is more like that of Polysip- 

 honia fastigiata, a plant that grows abundantly on the fronds of Fucus 

 nodosus ; microscopically, G. Jlahelligerum is known from others of the genus 

 by the unilateral spines, which arm the outer side of the branches, and the 

 opaque articulations distinguish it from G. acanthonotum, a species set with 

 spines in the same manner, but with transpiarent articulations. Gallitliavmion 



* A young specimen of S. interrupta has been found by my Mother in June of the present 

 year 1853 ou the beach at Lynmouth, North Devon; this locality affords several interesting 

 species. 



f In the Somersetshire Archaeological and Natural History Society's Museum at Taunton, there 

 is a collection, which I presentgd to that Society, containing well-fruited examples, with only 

 one or two exceptions of all the Alga^ entered in the list that accompanies the volume. 



