[From the Bulletin of the Torrey Botanical Clvb, 32: 563-586,//. 23-2Q. 1905 ] 



Phycological studies — II. New Chlorophyceae, new Rhodophyceae. 



and miscellaneous notes* 



Marshall Avery Howe 

 (With plates 23-29) 



A. NEW CHLOROPHYCEAE 



Halimeda favulosa sp. nov. 



Of a light bright-green when living, often albescent or yellowish 

 on drying, rather flaccid, suberect or more commonly decumbent 

 (especially if uncovered at low tide), somewhat easily friable when 

 dry, the surface then strongly favulose even to the naked eye and 

 with a subcrystalline lustre ; plants reaching a height or length of 

 9—22 cm., usually of congested habit, the numerous branches 

 mostly originating near the very short, flattened stipe, this con- 

 sisting of 1—4 more or less fused segments : rhizoids forming a 

 bulbous mass with the adherent granules of sand : segments vari- 

 able in form, ranging, without apparent order, from discoid and 

 often trilobed to cylindrical and entire in different parts of a single 

 individual, 4-9 mm. long, 2—9 mm. broad, 0.5—2 mm. thick: 

 peripheral utricles turbinate, subcrateriform, obovoid, or pestle- 

 shaped, 150-400/^ long, 1 10-260 /j. in diameter in surface view, 

 supported and separated by calcareous calyces, the exposed 

 rounded-obtuse or truncate apical portion strongly collapsed on 

 drying, even the whole utricle often withdrawing from the calcare- 

 ous lateral walls and shriveling to the bottom of the cup ; utricles 

 free on decalcification or but slightly and irregularly coherent ; 

 subcortical layer thin, the central filaments easily visible through 

 the cortex after removal of the lime : filaments of the central 

 strand coherent at the nodes, being there closely connected by 



* Investigation aided by a grant from the John Strong Newberry Fund of the 

 Council of the Scientific Alliance of New York. 



563 



