Fig. 140. LAUEENCIA C^SPITOSA. 



Coloitr. Dark livid-purple in deep water; greenish-yellow when exposed to sunlight. 

 Substance. Thickish; elastic; fleshy feeling. 



Character of Frond. Cylindrical or nearly so; as thick as a crow's quill; nearly one 

 width throughout; formally branched; tufted. Stems simple; generally naked 

 below; much and stiffly branched above; forming a pyramidal outline. Branches 

 erecting; spreading; the main ones often opposite; the lesser alternate; quite 

 cylindrical. Branchlets often much crowded;" sometimes simple, sometimes much 

 branched, alternately; always very erect; slightly tapering to the base; blunt 

 and abruptly cut off at top. 



Measurement. From 2 to 8 inches high. 



Fructification. Of two kinds. 1. Clustered s])ores in broadly ovate, unstalked (sessile) 



ca])sules; external. 2. Tetraspores immersed in the branchlets like dots. 

 Kahitat. Our coasts generally, within tide-marks. Common. 



Fig. 141. CHEYSYMENIA EOSEA. Var. Orcadensis. 



Colour. Bright rosy-red. 



Substance. Delicately membranaceous. 



Character of Frond. Flat; leaf-like; narrow-oblong; pointed; tapering to a thin 

 stem (sometimes abruptly) ; furnished on each side with exactly opposite, nar- 

 row-oblong, leaf-like branchlets; which now and then have the rudiments of a 

 third set. One or many from a root. 



Measurement. From 1 to 3 inches high. 



Fructification. Only one kind ascertained. Tetraspores collected into groups (sori), 



imbedded in the surface of both leaves and leaflets. 

 Habitat. Skaill and Sanda Frith, Orkney. On rocks and Laminaria digitata in deep 



water. 



Now Chylocladia rosea. 



Fig. 142. CHEYSYMENIA EOSEA. 



The description above given applies equally to this plant, except that the "narrow- 

 oblong" shape is narrower in Chrysymenia rosea vera than in the Orkney variety; and 

 in this respect it closely resembles the American plants which Dr. Harvey found and 

 named before the species was discovered in this country. C. rosea has many more habi- 

 tats than C. Orcadensis. Filey, in crevices of rocks on the north side of the bridge, 

 and on the stems of Laminaria digitata washed ashore in the bay; Firestone Bay, near 

 Plymouth; the break-water under the Hoe; and the shores of Mount Edgecombe, are 

 among its stations; by which it would appear that the lovely little plant is not particular 

 about the climate it inhabits. A drawing in the Brodie Herbarium figures a plant of 

 similar formation, except that the secondary leaflets are very narrow and very much 

 drawn out, and in one or two cases (if a professedly "exact" copy may be trusted), 

 bluntish at the tips. But specimens of much the same, and quite as extravagant pecu- 

 liarities, were picked up at Filey in 1850, where the plant now figured was found; and 

 have occurred elsewhere; it is to be presumed, therefore, that, like many other algae, C. 

 rosea is subject to vagaries of growth; and that Professor Arnott is right in believing 

 the now lost plant from which the drawing was made, to have been Chrysymenia rosea 

 vera. 



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