Marine Algm of Berwick-on-Tivecd. 275 



irregularly oval or oblong and borne at the apices of the branches. 

 The species was first noticed in England in 1845 by Nsegeli, 

 who named it Ectocarpus minimus in his Herbarium, but I believe 

 that the name has never been published. I am indebted to Dr. 

 Bo met for these particulars, as well as for the identification of 

 the species. 



Ectocarfus Holmesii, Batters. 



Linn. Journ. Bot., vol. xxiv., p. 454, pi. IS,* fig. 7-16. 

 Descr. et Fig. Ectocarpus Holmesii, Batter*, I.e. 



Exsicc. ,, ,, Holme*, Alg. Brit. Ear., no. 82. 



Si/n. Ectocarpus crinitus, Batters, (non Carm.) Berwk. Nat. Club 



Proc, vol. x., p. 537; Traill, Monogr. Alg. Firth Forth, p. 10. 

 Hab. On rocks in the shade near high-water mark.f Jan. — June. 



Rare. Berwick Bay, Sharper Head, Scremersfcon. 

 An interesting species, first observed at Minehead, more than 

 twenty years ago, by Miss I. Gifford — a lady whose little book 

 on British Marine Algse has done much to popularise the study 

 of Algology in this country. The late Dr. Walk. Arnott, to 

 whom specimens were submitted for identification, believed the 

 plant was identical with Carmichael's Ectocarpus crinitus, and for 

 many years it passed under that name, but as I have shown 

 elsewhere it does not agree with authentic specimens of that 

 species or with Harvey's description in Phycologia Britannica. 



In the disposition of its fruits the plant recalls Ectocarpus 

 irregularis or Ectocarpus pusillus, species which have very much 

 coarser filaments and are usually epiphytic. J 



Although it occurs at distant stations along the coast, such as 

 Minehead and Torquay in the South, and Berwick in the North, 

 Ectocarpus Holmesii does not appear to be a common or abundant 

 species anywhere. 



* The Linnean Society have kindly allowed this plate to be reprinted to 

 illustrate the present paper. (It is now Plate VIII.) 



f With us the plant usually grows on flat ledges in the shade of over- 

 hanging rocks, but at Minehead Miss Gifford finds it growing on stakes 

 and other wood-work, and not on rocks or mud. 



+ I would here note that in the form of Ectocarpus Holmesii, which 

 bears plurilocular sporangia, the filaments are slightly coarser (from "017 — 

 "02 mm. in diameter) than those of the plants bearing unilocular sporangia 

 which vary from '014 to '019 mm. in diameter. I am indebted to Mr T. 

 H. Buff ham for the above measurements, as aJso for those of Ralfsia 

 spongiocarpa and Phyllitis filiformis, and it was only through inadvertence 

 that I forgot to acknowledge this in the original description of those species. 



