History of British animals - University of Guam Marine Laboratory

514 ZOOPHYTA. CORALLINAD^. Jania.Gen. XXXIV. JANIA.— Branches subdividing dichotomously;filiform, with cylindrical joints.78. J. rubens.— Summits of the lower joints of the stem simple.—Not uncommon on the English, Irish, and Scottish coasts.This species is subject to considerable variation in its general appearanceand growth, arising from age and station.A. Nearly uniform in thickness throughout, branches terminating in shortbifid processes..— Corallina ramulis dichotomis, teneris, capillaribus, et rubentibus,Ellis, Cor. p. 50. No. 5. tab. xxiv. f. e. E—C. rubens, Pallas, El.p. 42G. No. 7-E. The last joint but one, swollen at the summit, a character more or lessconspicuous on the other joints. The terminal ones blunt C. dichotoma,capiilis densis, cristatis, spermophoris, fucis minimis teretibus adnascens,Ellis, Cor. p. 51. No. 7. tab. xxiv. f. f. F—Cor. cristata, Pall. El. p. 425.No. 6 Cor. rubens, Linn. Syst. p. 1304. No. 3.C. Joints supporting the two last subdivisions clavate, terminal ones inpairs slender, many-jointed, seldom dividing—Cor. alba spermophoros, capiilis,tenuissimis, Ellis, Cor. p. 51. No. 8. tab. xxiv. f. g. G. Both Pallasand Linnaeus make this a variety of var. B—It seems to be in the last stageof growth. The Cor. plumosa nivea, fuco minimo" tereti adnascens of Ell.Cor. p. 52. No. 9. tab. xxiv. f. h. H. H. 1., the C. globifera of Turt. B. Fauna,No. 701. p. 212, is certainly this species in its first stage of growth, and whenit consists of only two or three joints rising from a globular base. Var. A.is the next stage. In some cases, a few of the lower joints are two-horned,like the following species.79- J- cornicidata.— Summits of the lower joints of the stemsubcompressed, and produced on each side.Cor. alfea exigua, ramulis dichotomis segmentis corniculatis, fucis minimisteretibus adnascens, Ellis, Cor. p. 50. No. G. tab. xxiv. f. d. D—Cor. corn. Pallas, El. p. 424. Linn. Syst. p. 1305 On the Englishcoast, Ellis.Gen. XXXV. CORALLINA.—Branches subdividing trichotomously.In consequence of this mode of growth thereis always the appearance of a primary stem, and the summitsof the joints are compressed and dilated, except inold specimens, where thedestitute of lateral branches.lower jointsare cylindrical,and80. C. officinalis.— The short lateral shoots of the branchesrounded, and blunt or capitate.Cor. anglica, Raii, St. Br. p. 33. Ellis, Cor. p. 48. tab. xxiv. No. 23. a. A.A,— 1. A. 2. B. B. 1. B. 2—Cor. oflfl Pallas and Linnaus. Common onall parts of the coast.This is subject to vary greatly in its appearance, according to the stationit occupies. At certain seasons the heads of the pinnules are enlargedintocells, and similar tubercles occur on the sides of the joints, out of whichEllis squeezed " little twisted figures."