156 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



sporangia oblong or elongate-ovate, 150-200 fi long, 50-100 fi wide; 

 carposporic conceptacles conical, about 500 fx in diameter, 1-2 (or 3) on 

 either side of midrib; carpospores spherical to elongate-ovate, 40-70 fi 

 in diameter; antheridial conceptacles conical, about 500 ju. in diameter, 

 1-2 on either side of midrib. 



Type: Holotype is a collection by Manza, May 5, 1931, on sheet 

 545756 in the Herbarium of the University of California, Berkeley. An 

 isotype is in HAHF. 



Type locality: Nye's Point, Moss Beach, San Mateo County, 

 California. 



Mexican distribution: Cooper 875, Mar., Dawson 108-45, 

 Apr., Punta Descanso; D. 6500, Bahia Colnett, Mar. (dredged) ; 

 D. 10579, Punta Norte, Isla Cedros, Oct. 



The broad, short, prominently winged intergenicula, somewhat ex- 

 panded branch-tips, and rather dense dichotomous branching above com- 

 bined with irregular pinnate branching below are characteristic of this 

 species. The Cabo Colnett specimen is very much like the type in all 

 dimensions, whereas the Punta Descanso plants are somewhat smaller 

 throughout. 



Bossea ligulata Dawson sp. nov. 

 Plate 8, fig. 8 ; Plate 26, fig. 2 



Thallis 9-12 cm. altis, sparse, alternate, pinnate ramificatis, rami- 

 ficatione plerumque in partibus mediis internodia inferiora ramosque 

 terminales longa ligulataque efficiente; ramificatione accessoria et mul- 

 tif aria f requente a superficiebus complanatis intergeniculorum ; inter- 

 geniculis circa 1 mm. longis, 3-3.5 mm. latis in partibus mediis, prom- 

 inenter alatis costatisque, reductione unius alarum ad asymmetriam ten- 

 dentibus. 



Thalli saxicolous, 9-12 cm. high, consisting of several branched erect 

 parts from a crustose basal stratum ; erect parts subcylindric at the very 

 base, 0.5-0.8 mm. in diameter, otherwise expanded and strongly flattened 

 throughout, sparsely, alternately, pinnately, fastigiately branched, rarely 

 or not at all dichotomous, the branching mainly in mid-parts of the 

 thallus such that the lower internodes and terminal branches are long 

 and ligulate; accessory multifarious branching from the flattened sur- 

 faces of intergenicula frequent; genicula 200-230 fi long; intergenicula 

 broader than long, in mid-parts mostly a little more than 1 mm. long, 

 3-3.5 mm. wide, narrower above and below, prominently winged and 



