Ser. PtHODOSPEUME.E. Earn. Gel'uiiacece. 



Plate LXXV. 

 HENNEDYA CRISPA, Harv. 



Gen. Char. 8tem terete, branclied ; branches dilating upwards into a 

 flat, dichotomous, membranous frond, composed of three strata ; the 

 medullary stratum of very slender, anastomosing, densely interwoven 

 filaments ; 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 terminal 

 pore, 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, an 

 able microscopist and successful explorer of the Algse of Scotland. 



Stipes teres, ramosns ; rami sapice in frondem planam. metnbranaceam dlclioto- 

 mam stratis tribus contextam d'datatis. Stratum medullare ex fills teuuisshius 

 anastomosantibus densissime intertextis ; intermedium cellulis mac/nis vacuis uni- 

 seriatis ; corticate celt/dis m.i.mmis verticaliter ordinalis context/im. Fruct. : 1, 

 cystocarpia hemisphcsrica, elevata, iimbilicata, demum poro pertusa, ad apices 

 laciuiarum sessilia,fasciculos sporaruvi secusparietes loculi dispositos foventia ; 

 2, tetrasporcB zonatim divisce, in soris infra apices laciniarum ar/gregatcB. 



Hennedya cris^m, Harv. 



Hennedya crispa, Harv. in Trans. R. I. Acad. v. 22. p. 552. Air/. Austr. 

 Exsic. n. 331. 



Hab. Cast ashore from deep water. Rottnest Island, //'. H. H. Pre- 



m an tie, George Clifton. 

 Geogu. Djstr. West coasts of Australia. 



Descr. Root a large, hard disc. Fronds 6-12 inches high; stem hard and 

 woody, terete or compressed, 1-2 inches long, dividing into several 

 branches. Branches soon compressed, then flattened, and passing into the 

 base of a dichotomo-mnltifid, flabelliform, fastigiate, thinly membranous 

 lamina, wliose lowermost and principal segment is traversed by a vanishing 

 midrib, being the prolonged apex of the terete branch. The segments of 

 the lamina vary in breadth from \-\ or ^ inch ; they are linear or slightly 

 cuneate, with remarkably rounded axils, and very blunt but generally emar- 

 ginate apices. The whole frond is remarkably curled and undulated. The 

 conceptacles are generally solitary, sessile exactly at the emarginate tip 

 of the segment, but are sometimes two together and somewhat removed 

 from the tip : they are hemispherical, dimpled in the middle, and finally 



