Ser. Rhodospermejs. Fain. Ceramiacea. 



Plate XLIV. 



PTILOTA RHODOCALLIS, Haw. 



Gen. Char. Frond compressed or two-edged, distichous, pectinato-pinuate, 

 inarticulate, cellular, with an articulate, monosiphonous axis ; the pin- 

 nules sometimes articulate. Fructification : 1, involucrate favellm 

 terminating short branches and containing numerous angular spores; 

 2, tetraspores, attached to the pinnules, sessile or stalked, solitary or 

 glomerulate, tripartite. — Ptilota {Ag.) } from tttlXcotos, pinnated. 



From compressa v. anceps, disticha, pectinato-pinnata, corticata, axi artiadato 

 monosiphonio percursa ; pinnulis stepius corticatis, nunc pellucide articidatis. 

 Fruct. : 1, favellce involucratce in ramulo abbreviato terminates, sporas nume- 

 rosas angulatas foventes ; 2, tetraspora ad pinnulas sessites v. pedicellate, 

 sparse v. glomeratee, triangule divisce. 



Ptilota Bhodocallis ; frond slender, subcompressed, corticated, alternately 

 twice or thrice compounded ; branches and their divisions subdistant, 

 rod-like, closely pectinato-pinnate ; pinnules alternate, subulate, in- 

 articulate; involucre of several serrated leaflets; tetraspores glome- 

 rated near the tips of the pinnules. 



P. Bhodocallis ; fronde angusta subcompressa corticata alteme 2-S-decomposita ; 

 ramis majoribus minoribusque sparsis virgatis crebre pectinato-pinnatis ; pin- 

 nulis altemis subulatis inarticulatis ; foliolis involucri serratis ; tetrasporis 

 in glomerulum unilateralem ad marginem superiorem pinnularum creberrime 

 aggregatis. 



Ptilota Bhodocallis, Harv. Alg. Austr. Exsic. n. 478. 



Bhodocallis elegans, Kiitz. Sp. Alg. n. 670. 



IIab. Cast ashore. Abundant at Port Fairy, Victoria, Dr. Cardie, 

 W. H. H., etc. (and all collectors of " seaweeds"). At South Port, 

 Tasmania,/^ C. Stuart. 



Geogr. Distr. South coast of Australia. Tasmania ? 



Descr. Root discoid. Stem, for an inch or two above the base, clothed with 

 short, woolly hairs ; afterwards glabrous, cylindrical or more or less com- 

 pressed, undivided or once or twice forked, the divisions or main branches 

 4-6 inches long, continued throughout the frond. These principal branches 

 emit lateral branches at intervals^, of about half an inch, and these are in 

 turn once or twice similarly compounded. All the axils are acute, and the 

 divisions erecto-patent. Every part of the frond is elegantly pectinated 

 with short, alternate, subulate, acute ramuli, each about -^ inch long. No 

 articulations are superficially apparent in any part of the frond. The axial 

 tube is slender, surrounded by a double, very thick cortical layer. The 



