Fig. 140. LAURENCIA C^SPITOSA. 
Colour. 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 stifliy 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 spores in broadly ovate, unstalked (sessile) capsules ; 
external. 2. Tetraspores immersed in the branchlets like dots. 
Habitat. Our coasts generally, within tide-marks. Common. 
Fig. 141. CHRYSYMENIA ROSEA. Var. Obcadensis. 
Colour. Bright rosy-red. 
Substance. Delicately membranaceous. 
Character of Frond. Flat; leaf-like ; narrow-oblong ; pointed ; tapering to a thin stem (some- 
times abruptly) ; furnished on each side with exactly opposite, narrow-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. CHRYSYMENIA ROSEA. 
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 habitats 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 extrava- 
gant peculiarities, 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 algm, 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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