Howe : Phycological studies 565 



seen it is much flattened and in all the branching is much more 

 congested. Furthermore, it seems hardly probable that Kutzing, 

 doubtless studying a dried specimen, would have failed to notice 

 the peculiar and striking favulosity of the surface if he had had 

 before him the species described above. Kutzing's figure of Hali- 

 meda Monile (I. c. pi 26. f. 1) illustrates the habit of the monili- 

 form condition of H.favulosa rather well. 



Hauck (Hedwigia 25 : 168. 1886) has gone on record as hav- 

 ing seen an authentic specimen of H. brevicaulis* but neither in the 

 herbarium of Hauck nor that of Kutzing, both now owned by Mine. 

 Weber-van Bosse, is such a specimen to be found. The species is 

 unrepresented also in a set of cotypes sent by Kutzing to Montagne 

 and now preserved in the Museum d'Histoire Naturelle at Paris. 



The Ellis and Solander types of Halimeda are said also to have 

 disappeared t but none of their figures and descriptions of West 

 Indian forms is especially suggestive of H. favulosa; at least, 

 such an application is not likely to be proved in absence of original 

 specimens. 



In Halimeda favulosa, the peripheral utricles and sometimes the 



filaments of the subcortical layer and of the central strand are now 



and then gorged with dense granular contents as shown in our 



figure 4. We have found no evidence that such parts become 



detached, but for some reason a reserve food supply seems to be 



concentrated in them. 



Avrainvillea levis sp. nov. 



Olivaceous when living, on drying often slightly tinged with 

 yellow or verging toward cinereous, or at the margins sometimes 

 fuscous, caespitose or gregarious from a short, scarcely rhizoma- 

 tous base : stipe 0.5-4 cm. long, flattened or subcylindrical, simple 

 or occasionally dichotomous at base : flabellum varying from reni- 

 form-suborbicular with cordate base to cuneiform-obovate, 1—7 cm. 

 broad, entire, erose, or sometimes lobed, thin and membranous or 

 sometimes thicker and coriaceous, compact in texture with a 

 smooth or slightly wrinkled surface, for the most part distinctly 

 zonate, now and then tending to form serially superposed flabella 

 at the margins of the zones : filaments of flabellum slender, tortu- 

 ous, interwoven, usually lightly and irregularly torulose, rarely 



* Printed " multicaulis" by Hauck through an evident lapsus, as shown by label 

 on Comoro specimen cited. 



f Barton, E. S. The Genus Halimeda. Siboga-Expeditie, Monographe 60 : I, 

 2. 1 901. 



