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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es, and the shortness of the spore-threads, and the position of the zonate tetraspores in terminalpods, point rather to an affinity with Gelidiacea, where there-fore I place the genus. The structure of its conceptacles is ana-logous to that of Pterocladia; that of the frond is not very dif-ferent from that of Hypnea. At present Dicranema includes three species, D. revolutmn^D. Gremlin, and B.filiforme. The i>. pusillum of my Austr.Algse, n. 313, on more careful re-examination, proves to be aspecies of Mycliodea. Fig. 1. A tuft of DiCKANEMA REVOLUTUM, growing on the stems of Cymadoceaantarctica,—tlie natural size. 3. Portion of a frond, with conceptaclesbelow the tips. 3. Cross section of a conceptacle. 4. Spores from thesame. 5. Portion of a frond with pod-like tips containing tetraspores.6. Section of the cortical layer of a swollen tip, showing the tetraspores insitu. 7. Tetraspores. 8. Cross section of the frond :—all but the firstfigure more or less magnified. ^rtoM- .Liiy.
Text Appearing After Image:
Vin.ceni Bn>ilfK.lr..i Ser. PtHODOSPEUME.E. Earn. Geluiiacece. Plate LXXV.HENNEDYA CRISPA, Harv. Gen. Char. 8tem terete, branclied; branches dilating upwards into aflat, dichotomous, membranous frond, composed of three strata; themedullary stratum of very slender, anastomosing, densely interwovenfilaments; the intermediate of large empty cells, in a single row;the cortical of minute, coloured, vertically seriated cellules. Fructi-fication : 1, hemispherical, umbilicated conceptacles, with a terminalpore, sessile near the tips of the segments, containing tufts of pedi-cellate, subpyriform spores attached to numerous, parietal placentae;2, zonate tetraspores, in sori, beneath the tips of the segments.—Hennedya (Harv.), in honour of Roger Henned), of Glasgow, anable microscopist and successful explorer of the Algse of Scotland. Stipes teres, ramosns; rami sapice in frondem planam. metnbranaceam dlclioto-mam stratis tribus contextam ddatatis. Stratum medullare ex fills teuuisshiusana

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