39. CALLITHAMNION, Lyngb.
1. Callithamnion Plumula, Agardh, Sp. Alg. vol. ii. p. 159.
Hab. Hermite Island, Cape Horn; dredged up from about seven fathom water; very rare.
Decidedly the same as the European and North American plant.
2. Callithaiinion simile, Hook. fil. et Harv.; fronde subsolitaria rigidiuscula ramosissima, ramis alternis v. subdicliotomis articulatis enerviis, ramulis brevissimis oppositis disticliis crassis sursum peetinatis e quoque raruoruin articulo liorizontaliter porrectis, pinnulis robustis simplicibus rarnosisve, articulis ramorum diarnetro sesqui-duplo longioribus, ramulorum diametrurn subaequantibus.
Hab. Christmas Harbour, Kerguelen's Land ; rare.
From 2-5 unc. longa, gracilis, rigidiuscula, repetitim distiche ramosa; ramis omnibus articulatis, asquilatis. Rmmili lin. longi, distiche oppositi, e medio articuli cujusvis per totam frondis longitudinem orti, robusti, subacuti. liorizontaliter patentes, secus marginem superiorem dispositi, ramuhs secundariis obsiti. Color fnsco-ruber.
C. Plumula simillimum, sed rigidiusculum, ramis latioribus, ramuhs robustioribus artieulisque brevioribus.
This so closely resembles the C. Plumula, that it is difficult by mere words to discriminate them; yet, on comparing them under the microscope, they are obviously distinct. C. simile is a much coarser and more rigid plant, with the ramuli more robust in proportion to the diameter of the articulation they spring from, and the articulations themselves are shorter. Again, from the circumstance of the true C. Plumula occurring at Cape Horn, where this, (the only Kerguelen's Land species), does not appear, we incline to regard the present as a representative species rather than a variety.
3. Callithamnion Ptilota, Hook. fil. et Harv. ; parvum, rigidulum, setaceum, fronde pinnatim rarnosissima, ramis vix disticliis venoso-striatis subopacis, secundariis opposite pinnulatis, pinnulis simplicibus patentibus subulatis e quoque ramorum articulo ortis, articulis diarnetro duplo longioribus. Nobis in Lond.
Journ. Bot. vol. iv. p. 272. (Tab. CLXXXIX. Kg. I.)
Hab. Crozet Islands; on a floating mass of Macrocgstis pyrifera. From 1-2 unc. longa. Caulis crassitudine seta? equina;, repetitim pinnatim ramosus ; ramis suboppositis patentibus demum deflexis, inferioribus subuncialibus ; secundariis breviusculis pinnatis, pinnis plurimis densis, oppositis, simplicibus, subulatis, e omni articulo rami ortis. Color fusco-ruber: — chartas vix adhaeret. Only one specimen of this very distinct little species was found : it grew on a piece of floating sea-weed, picked up at a considerable distance from the shore.
Plate CLXXXIX. Fig. I. — 1, plant of the natural size ; 2, ramuli ; 3, ditto with sphaerospores : — all magnified.
4. Callithamnion ternifolium, Hook. fil. et Harv. ; perpusilhvm, vage dichotome ramosum, ramis pellucide articulatis, ramulis seepissime ternis e omni ramorum articulo ortis erecto-patentibus brevibus gracilibus simplicibus, articulis ramorivm diarnetro 4-5-plo ramulorum subduplo longioribus, favellis magnis bilobis ramos terminantibus. Nobis in Lond. Joum. Bot. vol. iv. p. 272. (Tab. CLXXXIX. Fig. II.)
Hab. Hermite. Island, Cape Horn ; dredged up from about eight fathom water ; parasitic on other Alga.
Species perpusilla, parasitica, csespitosa, sub i unc. longa, vage ramosa, rosea, flaccida et membrauacea. Ramuli plerumque e quoque articulo terni, raro bini quaternive, graciles, breves, simphces. Articuli caulis ramorumque elongati. Favellce magnae.
