An introduction to the study of seaweeds / by George Murray.

  • Murray, George (George Robert Milne), 1858-
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to the study of seaweeds / by George Murray. Source: Wellcome Collection.

    181/324 (page 151)
    selves gametangia, bearing gametes which conjugate, and so form a zygote. The Geographical Distribution.—The Acetabulariece are a tropical and subtropical order. Of the fifteen species of Acetdbularia, one however occurs in the Mediterranean and A. Peniculus on the West Australian coast. They occur in all tropical seas. Halicwyne has two species, one (H. Wrightii) in the China sea and the other (H. spicata) on the shores of New Caledonia. Chalmasia has only one species, G. Antillana, and Acicularia is represented alive only in the warm Atlantic (West Indies and South America). Dasycladece. The Thallus.—This sub-order is characterised by the persistence of the whorls of hairs and by there being no distinction between fertile and sterile whorls—they are all fertile, except locally in the joints of Cymopolia—and by the gametangia being terminal members of the lateral branches, except in Botryophora where they are of lateral origin on these branches. In Dasycladus the shoot is nowhere incrusted, and consists of a short erect axial cell without con- strictions or cross-walls, attached to the substratum by a holdfast, and clothed with whorls of branches, about twelve to each whorl. These are again branched in whorls several times, each successive whorl diminishing outwards in length and in the number of branches. At the apex of the ultimate whorl there is produced a single globular sporangium