Page:The Botany of the Antarctic Voyage.djvu/538

502

1. ANABAINA tenar, Hook. fil. et Harv.; strato globuloso definito lobato gelatinoso fluctuante æruginoso, filis densissiuie intertextis flexuosis moniliformibus inæqualibus hic illie interruptis, articulis plerumque globosis angulatisve nunc transverse elongatis, majoribus ellipticis oblongis limbo hyalino cinctis solitariis plurimisve. Sphærozyga tenax, ''nobis in Lond. Journ. Bot''. vol. iv. p. 298. (TAB. CXCIII. Fig. III.) HAB. Falkland Islands; in small pools of water on the hills.

Stratum 1-3 unc. latum, e massis ¼-½ uncialibus conglobatis efformatum, gelatinosum, hyalinum, pulchre æruginosum, natans. Substantia gelatinosa, sub lente oeulum fugiens. Fila perplurima, dense aggregata, diametro varia. Articuli sub lente glauco-virescentes, opacæ, majores translucidse.

A very distinct and beautiful species, evidently congeneric with the Spharozyga Jacobi, of which the Rev. M. J. Berkeley has published an excellent figure in the Supplement to English Botany, (t. 2826. fig. 2.) but which we do not consider generically distinct from Anabaina. The granular substance of the larger articuli is of a different nature from that filling the smaller one, being more transparent, and confined in a proper cyst, between which and the border of the articulation there is a transparent space. The stratum is as firm as that of Nostoc coeruleum, and the specimens preserved resemble a dried mass of OsciUatoria. Specifically this differs from A. Jacobi in the form of the stratum, and from A. flos-aqua in the straightness of the larger articulations. Plate CXCIII. Fig. III. — 1, plant of the natural size; 2, threads; 3, portion of a thread with spores ; 4, spores : — highly magnified. 60. CHROOLEPUS, Ag. 1. Chroolepvjs aureus, Harv. in Hook. Brit. Flor. vol. ii. p. 380. Conferva anrea, Bittwyn, Hist. Conf. t, 35. Hab. Hermite Island, Cape Horn ; Kerguelen's Land, and the Falkland Islands ; very abundant on the under surfaces of rocks near the sea, &c. One of the commonest vegetable productions in the Antarctic Islands, growing under circumstances where no Lichen, or other cryptogamic plant, flourishes. It was always found near the Lecanora miniata, and is very abundant in situations sheltered from the direct rays of the sun. When fresh, or rather during drying, it emits a very evident smell of violets. 2. Chroolepus ebeneus, Ag. Syst. Alg. p. 36. Conferva ebenea, Billwyn, t. 101. Byssus niger, Engl. Bot. t. 702. Hab. Hermite Island, Cape Horn ; in clefts of rocks in the woods. Like the former, this species, invariably shuns the light in the south. It was found in damper places than C. aureus. Both are, very probably, abnormal states of some Lichen.