Identifier: phycologiaaustra02harv (find matches)
Title: Phycologia australica; or, A history of Australian sea weeds ... and a synopsis of all known Australian Algae ..
Year: 1859 (1850s)
Authors: Harvey, William H. (William Henry), 1811-1866
Subjects: Algae
Publisher: London, L. Reeve
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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ch much resembles some forms of J). dicJio- toma in habit, differs from that and from all others of the genusBidyota in wanting the woolly or stupose root; in place ofwhich it is furnished with more or less abundant fibrils, issuingwithout order from the lower portion of the frond, and attachingthemselves to neighbouring Algae. Had these only been foundon one or two individuals, I should probably have taken themfor a mere aberration, but finding them sufficiently constant inmany specimens, collected in different localities and at differenttimes, I am induced to regard them as an essential character, bywhich the present species may be most easily distinguished fromothers. As in D. dichotoma, the frond varies much in breadth, butscarcely in any other respect. Our figure represents an averagespecimen. Fig. 1. DicTYOTA KADiCANs,—the natural size. 2. Portion of the membrane,mmjnified, to show the reticulation. 3. A cross section of the same, show-ing: the internal structure. Tlat&CXX
Text Appearing After Image:
^fciiTsal Brc.-iLS imr Ser. RnoDOSPERMEiE. Fam. Gelidiacea. Plate CXX. DICRANEMA GREVILLEI, Sond. Gen. Char. Frond terete, dichotomous, formed of three strata; the me-didlary stratum of slender, closely packed, longitudinal filaments; theintermediate of angular cells, smaller toward the circumference; thecortical of vertically seriated, minute, coloured cellules. Fructifica-tion : 1, hemispherical conceptacles, containing, within a thick peri-carp, pedicellate, obovate spores, attached to a parietal fibro-cellularplacenta (formed from the medullary stratum); 2, zonate tetraspores,lodged in the swollen (pod-like) tips of the branches.—Dickanema(Sand.), from BtKpavov, a forh, and V7)\xa, a thread. FroHS teretiuscula, dichotoma, stratis trlbiis contexta. Stratum medullare exfills longitudlnalibus tenidhiis densis; intermedium celluUs rotundato-angu-latis, exterioribus minoribus; corticate cellidis minimis coloratis verticaliterseriatis. Fruct.: 1, cijstocarpia hemisphcerica, intra peri

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