Phycologia australica; or, A history of Australian sea weeds ..and a synopsis of all known Australian Algae .. . 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 The i>. pusillum of my , n. 313, on more careful re-examination, pr
Phycologia australica; or, A history of Australian sea weeds ..and a synopsis of all known Australian Algae .. . 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 The i>. pusillum of my , 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 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- . Bn> Ser. Earn. Geluiiacece. Plate 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 fronde
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Keywords: ., bookauthorharveywi, bookcentury1800, bookdecade1850, bookyear1859
