194 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



Bossea Gardneri Manza 



Plate 57 



Manza 1937b, p. 563; 1940, p. 306, pi. 15; Smith 1944, p. 235, pi. 



52, fig. 2. 



These plants are equivalent to the more slender specimens determined 

 by Manza and to be found in the herbarium of the University of Cali- 

 fornia, except that they rarely have four conceptacles on each segment 

 face, but instead generally have two. This character Manza (1937b, pp. 

 563, 564) emphasizes as a feature distinguishing these plants from B. 

 Orbigniana (Decaisne) Manza (1937, p. 563), but more striking is the 

 attenuate character of the latter, and the markedly serrate margin of the 

 branches, caused by the sharp divergent upper angles of the segments. 

 Manza's specimens of B. Gardneri show two conceptacles on each seg- 

 ment in the upper branches, and occasionally as many as 6 or 7 on the 

 lower ones. 



Mexico: Baja California, on littoral rocks in pools at South Bay, 

 I. Cerros, no. 34-643 A, 10 Mar. 1934. 



Bossea pachyclada n. sp.^^' 

 Plate 58 



Plants to 1 dm tall, very bushy, closely dichotomously or trichot- 

 omously branched ; segments of the primary axis at the base terete, those 

 near the lower forks compressed, those in the upper segments glossy, thick, 

 flat, the midline considerably thicker than the margin and sometimes 

 faintly angled; below rectangular, above with the distal end transverse, 

 rarely a little retuse, much broader than the proximal, the angles rounded, 

 tapering sharply to the lower articulation zone, the width about 1.5-2.0 

 times the length, reaching about 4 mm ; conceptacles generally two on one 

 face of a segment, rarely 3 or 4, rather large, with a central pore. 



Mexico: Baja California, on littoral rocks in pools at South Bay, I. 

 Cerros, no. 34-643B, 10 Mar. 1934. 



The segments in the coarser California Bosseas have the lateral or 

 wing section pretty much as wide at the bottom of the segment as at the 

 top, or if not, the upper angles project distally. These features are not 

 noted in this species, where there is a distinct angle between the nearly 

 transverse upper margin and the sides of the segment above. In this 



115 Bossea pachyclada n. sp. — Plantae ad 1 dm altitudine, fruticosae, arcte 

 subdichotome aut subtrichotome ramosae, segmentis infra teretibus, supra com- 

 pressis ad planata, vix ad 4 mm lat., et circa 0.5-0.33 brevioribus quam latis, lineam 

 mediam crassiorem atque paene costatam habentibus, rectangularibus ad truncato- 

 cuneata, extremitate transversa multo latiore quam extremitate proximali ; con- 

 ceptaculis plerumque binis utraque in superficie segmenti. Planta typica in loco 

 dicto I. Cerros, Baja California, Mexico, legit W. R. Taylor no. 34-643B, 10 Mar. 

 1934. 



