MARINE ALGAK FROM KASTi'K ISLAM • 



3°7 



Indian work (p. 384, fig. 369). The form figured is somewhat more densely 

 branched and the thallus slightly coarser (500 — 600 ji), but otherwise they seem 

 to agree so well with each other that I am inclined to regard them as forms 

 of the same species. 



//. Esperi differs from H. pannosa J. Ag., collected on the Pacific coast 

 of Mexico (San Augustin, LlEBMANN) by its more slender and less ramose 

 thallus, H. pannosa being described as »densissime intricato decomposito- 

 ramosissima». 



Area of distribution: Brazil, Chile, Australia, Easter Island. 



Fam. Rhodymeniaceae. 

 Chrysymenia J. Ag. 



C. Skottsbergii nov. spec. — Figs. 49, 50. 



E callo radicali expanso frondes erectae, plerumque 1 — 2 cm altae, oriuntur, 

 caespitem densum et expansum formantes. 



Caules crassius filiformes, in parte basali robustiores (ca. 1 mm lati) su- 

 perne gradatim tenuiores et ramosi, 5 — 6 vel plures ramos vesicaeformes gerentes. 



Vesiculae subglobosae-pyriformes, 4 — 5 mm latae et 5—6 mm longae. 



Fig. 49. Chrysymenia Skottsbergii nov. spec, parts ot specimens. C. 2,5/1. 



This fine plant forms low, ca. 1 — 2 cm high, dense tufts on Lithothamnion 

 to which it is fastened by means a large irregular disc. From this the erect 

 main filaments (stems) arise. These are mostly undivided in their lower half, 

 irregularly ramified to all sides in the upper, the branches and, if these are 

 branched again, the branchlets all ending in a vesicle. In this way each main 

 branch may carry up to ten or even more vesicles. 



The stem is thickest, c. 1 mm, in the basal part, tapering gradually 

 upwards. 



The vesicles are spherical-pyriform, about 4—5 mm broad and 5 — 6 mm long. 



The stem is solid. A transverse section (Fig. 50 a) shows a cortical layer 

 consisting of quite smal roundish thick-walled cells arranged in more or less 



