14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL.98 



Gracilaria pinnata Setchell & Gardner 



Small pieces dredged at 20-30 m. between Belcher Point and the 

 anchorage, Magdalena Bay, Baja California, Mexico (Schmitt 3), 

 July 18, 1938. " 



CERAMIACEAE 



Centroceras clavulatum (C. Agardh) Montagne 



Probably from reef pools, Old Providence Island, Colombia, with 

 Valonia ventricosa (Schmitt 32), with Amphiroa fragilissima 



(Schmitt 49), August 6, 1938. 



Ceramium byssoideum Harvey 



In shallow water, probably on reefs, Old Providence Island, Colom- 

 bia, on Acanthophora spicifera (Schmitt 46), on Laurencia obtusa 

 (Schmitt 51), August 6, 1938. 



Ceramium fastigiatum Harvey, forma 



Small tufts scattered among masses of Griffithsia, 1-2 cm. tall. The 

 older filaments usually reached a diameter of about 85 fx, with inter- 

 nodes about 240 jx long, and only exceptionally did the diameter reach 

 180 jx, when the internodes were but 150 p long and the nodes only 

 30 fx deep; nodes of only 1-2 rows of cells, even in the largest. 



These plants in diameter of the filaments and character of the 

 forcipate apices are intermediate between the northern Atlantic C. 

 fastigiatum and the tropical forma flaccidum Petersen, the nodes par- 

 ticularly resembling the latter. 



Dredged sparingly at 12-20 m. with GrifHthsia over sandy bottom 

 off Punta Gorda and nearby, Cap San Lucas, Baja California, Mexico 

 (Schmitt 12), July 19, 1938. 



Griffithsia multiramosa (Setchell & Gardner), n. comb., n. var. minor 4 



Plants forming gregarious tufts about 2-4 cm. tall, extremely soft, 

 almost lubricous in texture, bright rose pink when dried ; filaments 



1 Griffithsia multiramosa n. var. minor. — Plantae gregareae, ramosae, gran- 

 diores 2-4 cm. altae, flaccidae, filamentis plerumque pseudodichotomis, dichotomiis 

 deorsum obtuse sursum acute angulatis; cellulis cylindricis, eis infra dichotomias 

 positis subclavatis, eis ramorum inferiorum ad nodos paululum distentis; filamentis 

 plantae basin interdum 300 n diam., cellulis inferioribus longitudine usque ad 

 1260 fi, in media plantae parte crassitudine usque ad 125 /x, longitudine usque ad 

 970 fi, in ramulis ultimis crassitudine 15-20 /x, longitudine 100-200 n ; ramulis 

 sursum angustatis, apice rotundatis ; tetrasporangiis lateralibus, solitariis, in 

 pedicellis unicellulis sedentibus, absque involucris ; pilis pellucidis nullis. Plantae 

 sexuales ignotae. 



