NO. 1 TAYLOR: PACIFIC MARINE ALGAE 193 



KEY TO SPECIES 



1. Segments in the upper branches subequal or rather longer than 

 broad B. angustata 



1. Segments above subequal, or more commonly much broader than 

 long 2 



2. Upper segments thinner, reaching 2.5-3.0 times as wide as the 

 length measured along the axis B. Gardner! 



2. Upper segments thicker, larger, reaching about 1.5-2.0 times as 

 wide as the length along the axis B. pachyclada 



Bossea angustata n. sp.^^* 

 Plate 59 



Plants to about 1 dm tall, bushy, without dominant main axes, sub- 

 dichotomous to oppositely branched; segments of the primary axis near 

 the base terete, those above the first forks becoming compressed, those in 

 the upper segments thin, flat, rectangular to slightly wider at the distal 

 end, the upper angles rounded to obtuse, never acutely produced, little 

 wider than the articulation, the length and width about equal, or the 

 length to one half greater than the width, rarely less except for segments 

 bearing a branch, rarely reaching 2 mm; segments somewhat thicker in 

 the center, but without evident costa ; conceptacles generally 2 on one face 

 of a segment, sometimes 3 or rarely 4, relatively large, so that two when 

 side by side occupy nearly all the width of a segment, each with a central 

 pore ; terete or flat proliferations from the faces of the segments not un- 

 common, becoming several segments long. 



This species has more slender branches than any of the large ones 

 except B. Orbigniana and B. Gardneri. From the former it differs in that 

 it is coarser and the upper segment angles are not acutely produced, a 

 feature which makes the outer branches of B. Orbigniana acutely serrate 

 (Phyc. Bor.-Amer. 398). From the latter it differs in narrower, pro- 

 portionately longer segments which lack the rounded lateral lobes promi- 

 nent in B. Gardneri. 



Mexico: Baja California, at I. San Benito, coll. W. L. Schmitt, 6 

 Apr. 1933. 



114 Bossea angustata n. sp. — Plantae ad 1 dm altitudine, fruticosae, subdichot- 

 ome ramosae, infra segmentis teretibus, supra subcompressis ad plana, vix ad 2 

 mm lat., 2-3 mm long., ecostatis, rectangularibus aut in extremitate distall paululo 

 latioribus, angulis superioribus rotundatis, pauIo latioribus quam articulatione; 

 conceptaculis plerumque duobus una in superficie segmenti. Planta typica in loco 

 dicto I. San Benito, Baja California, Mexico, legit W. L. Schmitt, 6 Apr. 1933. 



