114 Ahimouth Marine Algae. By Andrew Amory. 



Between the Aln and Birling Car are some flat-lying rocks, which at 

 times are buried in sand. When they are exposed, C. cerea may be found 

 plentifully on the sand-covered rocky bottoms of the stretch of shallow 

 pools nearest high water mark, growing in tufts and communities of tufts, 

 unlike C. melagonmm, which is found at various parts of the bay, but 

 always near low water mark, and only a few scattered fronds in one 

 place. My specimens of C. cerea were gathered in good condition in 

 October ; and the same locality at the same date furnished a few plants 

 of the small Sphacelaria radicans growing in company with Callithamnion 

 floridulum. This is also our locality for Gracilaria confervoides, where it 

 grows abundantly in strong bushy tufts, fruiting in September. Cast up 

 on the south sands near this place a large Himanthalia loreu brought 

 ashore my iirst specimens of Ectocarpus fasciculatus, with which it was 

 covered. 



August 1st, 1887. — Myrotrichia filiformis and Calothrix confervicola on 

 decayed Ceramium rubrum. M. filiformis also growing in company with 

 M. clavceformis on Chorda lomentaria ; and a beautiful diminutive 

 Chylocladia clavellosa from a rock-pool near low water mark, the only one 

 I have seen in such a position. In my first list I gave C. clavellosa as 

 rather rare at Alnmouth, as in several years I had only seen a few cast 

 up; but this date upset that conclusion, as hundreds were floating in with 

 the tide — some with tetraspores, others with capsular fruit : flat fern-like 

 specimens to luxuriantly bushy ones. I have given Desmarestia liyulata 

 on the strength of four pieces — the largest a foot in length, picked up at 

 odd times at the north end of Alnmouth rocks in front of Foxton, which 

 is a favourite hunting-ground for cast-up rarities. I), aculeata is cmite 

 common, and entire plants of D. viridis are met with occasionally ; but 

 having found only broken parts of D. .ligulata, I conjecture it may come 

 from a distance. 



JDelesseria hypoglossum, cast up, north sands, autumn, very rare. 1 have 

 seen but four specimens. Nitophyllum punctatum, also rare— two speci- 

 mens cast up, Foxton, one with tetraspores, the other with capsular fruit, 

 October 1887. 



Petrocelis ffennedyi, a closely adhering smooth skin-like growth — 

 frequent on Lamiuaria stems. Melobesia laminarice, the chalk}' parasite 

 of the stems of L. digitata, commoner still ; and If. polymorpha, like a 

 stony lichen, very common on the rocks, about Foxton. These additions 

 bring my list up to the very respectable figure of 113 species, although 

 yet far from complete. 





