1919J Gardner: New Pacific Coast Marine Algae IV 493 



segments 4-6 diam. long, after division segments 1-2 diam. long; 

 eliromatophore a coarse, parietal network ; pyrenoids small, numerous, 

 40-50 in resting segments; wall 2/a thick, homogeneous; rhizoids short, 

 mere prolongations of cells, non septate, rare ; zoospores and gametes 

 unknown. 



Growing attached in mud, or floating on mud flats between tides. 

 Roche Harbor. Washington, and Berkeley and Alameda, on the shores 

 of San Francisco Bay. California. 



This form closely resembles 7?. riparium f. validum Foslie, ))ut is 

 practically free from rhizoids, has tliiinier walls and larger and 

 longer segments. From li. implexum it differs in having broader, 

 straighter filaments of very different consistency, as well as usually 

 longer segments. TTnlike other species of Rhizoclonmm, it is very 

 lubricous, in mass, having the consistency of a Spirogyra. 



Hormiscia sphaerulifera Setchell et Gardner sp. nov. 



Plate 42, fig. 2 



Filis maxime lubricis, laete viridibus, corpore protoplasmatico 

 siccitate atro viridi. 4-6 cm. longis, usque ad 700/* cliam.. ad basim 

 abrupte attenuatis, superne diametro uniformibus; rhizoideis intra- 

 matricalibus e 15-20 segmentis oriendis aifixis; segmentis 0.5-2-plo 

 diametro longioribus, juvenis cylindricis, maturitate sphaericis; 

 chromatophoris taeniatis annulatis parietalibus juvenis tenuibus fene- 

 stratisque, aetate provecta solidis imperforatisque ; pyrenoideis parvis, 

 numerosis. 



Filaments very lubricous, bright green, protoplast becoming dark 

 when dry, 4-6 cm. long, up to TOO/i diam., tapering abruptly at the 

 base, of nearly luiiform diameter above, attached by intramatrical 

 rhizoids. from 15-20 segments; segments 0.5-2 times as long as the 

 diameter and cylindrical when young, becoming almost spherical at 

 maturity; chrbmatophore a thin fenestrate band when young, becom- 

 ing solid when nearing the reproductive stage, pyrenoids small, 

 numerous. 



Growing on boulders in the extreme lower littoral belt. AVest Coast 

 of AVhidbev Island. Washington. Tvpe no. 671 (Herb. Univ. Calif, no. 

 98547), Gardner. 



Urospora Wor)nskiohlii Setchell & Gardner. Alg. X. AV. Amer., 

 1903. p. 221 (in part). No. 234, Gardner (Herb.' Univ. Calif, no. 

 98545) and Collins. Holden and Setchell, Phyc. Bor.-Amer. (Exsicc). 

 no. 915. sub Urospora Wormskioldii (INIertens) Rosenv. seems to be of 

 the same species, the plants in general being more mature but in less 

 typical condition, the material nut having been mounted when fresh. 



