59° • WILLIAM ALBERT SETCHELL 



SVEDELIL'S (loc. cit.) does not mention hairs on the utricles of his Codiiou 

 dhnorpJium, nor does he figure them. Examination of a portion of his type 

 material fails to show hairs present even on the primary fruiting utricles. It 

 may be considered, therefore, that hairs are lacking in C. dimorplium Sved. 

 In all three specimens of C. cerebrifornic hairs (or hair-scars) are prominent on 

 the primary and pseudo-primar}- utricles at a fairK' early stage in the deve- 

 lopment of the utricle fascicles (see plate 39, figures 2 — 5). This fact, together 

 with the possibly less striking differences in habit, justifies the separation of 

 the Juan Fernandez plants from those of Melinca in the Guiatecas Islands. The 

 lack of the galeate thickened tip, so characteristic of the primary utricles of 

 C. difforme, may further serve to distinguish them. A peculiarity of the >hair 

 zone» in the utricles of C. cerebriforuie, not confined to it, but strikingly deve- 

 loped, is its abruptly swollen character. This can readily be seen from the 

 figures (see plate 39, figures 2 — 5). Unfortunately no gametangia have been 

 observed in any one of the available plants of C. cerebriforvie. 



The utricles of both species are of the long and slender type (macro- 

 stenophyse) which is also characteristic of typical (or true) Codiimi adhaej-cns 

 C. Ag. Both species are members of the Adhaerentia, as usually used in the 

 extended sense, but not in the sense as limited by the author (see Setchell, 

 in A. II. S. Lucas, Proc Linn. Soc, X. S. W., 60: 200, 1935) unless the 

 general diagnosis as to habit is extended to include species with much more 

 pulvinate thalli, such as these two South American plants show. The utricles, 

 however, are in agreement as to general shape and dimensions. It seems pos- 

 sible that a species group, or >:>Anepsiotes» (a cousinship) »Intertexta», based 

 on the striking lobation of these two species and bearing a definite relation to, 

 and certainly including the Codiuvi intcrtextiiin Collins, of Bermuda and the 

 Bahaman region of the north Atlantic Ocean, should be recognized. 



Codinvi diniorpJium Sved. 



SvEDELlLS, Algen aus den Landern der Magellansstrasse und W'estpata- 

 gonien, I, Chlorophyceae (in Wiss. Ergebn. Schwed. Exped. nach den Magel- 

 lanslandern 1895 — 97, unter Leitung von Otto Noruenskjold, 3, No. 8:) 

 300—304, pi. 16, fig. I, pi. 17, figs. 16—19. 1900; O. C. Schmidt, Bibl. Bot., 

 Heft 91: 29, figs. 9, 10, 1923; (non ANNIE May Hurd, Puget Sound Mar. Sta. 

 Pub., I, No. 19: 211 — 219, pi. 37, 1916, nee CoLLiNS, Green Alg. N. A., second 

 suppl. paper. Tufts College Studies, 4, No, 7: 88, 191 8). 



CodiuJii dimorplium was named by SvEDELlUS because of the seeming 

 existence of two distinct types of utricles, those on the margins of the lobes 

 being somewhat more swollen above, with a galeate thickened membrane at 

 the tip (see SvEDELlUS, loc. cit., figs. 16 and 18) and sterile, while those of 

 the inner surfaces of the lobes are fertile, more cylindrical, even to the apex, 

 and the apical membrane very little or not at all thickened. After an examination 

 of a fragment of the type material, although both types of utricles were found, 

 the strict distribution indicated by SvEDELlUS could not be confirmed. Galeate 

 utricles were found more generally dispersed and were indicated simply as 



