APPENDIX. 



Fructification. Not clearly ascertained. Professor Agardh indeed says ifc ""bears 

 tetraspores, but these have not been found in Great Britain. Dr. Walker 

 Arnott assures us after patient study of the two species, that he has never 

 seen a single specimen of C. adhcerens in tetrasporic fruit. This species, how- 

 ever, bears very commonly certain green spore-liice bodies or sacs, which look 

 at first sight like fructification, but on examination cannot be ascertained to 

 be such. It is remarkable that these sacs are not found on C. pellita, on 

 which the tetrasporic I'ruit is not uncommon, and Dr. Arnott inclines to the 

 belief that C. adhcerens is merely a barren form of C. pellita. 



JECdbitat. Kilcreggan. Opposite Gourock: Professor Walker Arnott. Aberdeen: Dr. 

 Dickie. Penzance: Mr. Palf's. Kilkee, 1844, Cushendall, Co. Antrim, 1850; 

 Dr. Harvey. And probably in many other places. On rocks between tide- 

 marks. 



These odd incrustations form red stains on rocks and stones, as if blood had 

 been spilt there, and can only be removed by a knife; and, of course, can 

 only be understood by examination under the microscope. 



ACTIlSrOCOCCUS HENNEDYI. 



Colour. Deep red. 



Suhstance. Toughish, but rather gelatinous. 



Character of Frond. An incrustation found on the Laminaria stems; composed of 

 minute, closely-packed, upright-jointed bead-like threads {filaments), set in 

 gelatine. Filaments tapering upwards; bead-like; sometimes simple, but fre- 

 quently once or twice branched. 



Measurement. Indefinite in outline. 



Fructification. Only one kind known. Large tetraspores, formed by degrees in 

 nearly all the joints of the threads, transforming them into "necklace-like 

 strings of deep red beads." Each tetraspore divided cross-wise (cruciate). 



Habitat. On an old root of Laminaria digitata at Cumbrse: Mr. Eoger Hennedy. 

 1852. 



A beautiful microscopic object. For a scientific account and figure of this 

 plant and others, see Natural History Review for 1857, "Proceedings of 

 Societies," p. 201. 



B. FAWCETT, PRINTER, DRIFFIELD. 



