THE GREEN ALGAE OP NORTH AMERICA 83 



stiffer, and with shorter cells, with lesser differences as above 

 noted. 



58. C. REPENS (J. Ag.) Harvey, 1846-51, PI. CCXXXVI ; 

 P. B.-A-, No. 2071 ; Conjerva repens]. G. Agardh, 1842, p. 13. 

 Filaments 100-150 p. diam., loosely dichotomous, not tapering to 

 apices ; cells below 2-3 diam. long, above 6-8, rarely 10 diam. 

 Color dull, dark green ; forming dense pulvinate spongy masses 

 at low water mark and between tides. Bermuda. Mediterranean. 



A coarse, matted, unattractive plant. 



59. C. FRASCATII Collins & Hervey, 1917, p. 49; P. B.-A., 

 No. 2164. L,ow, 1-2 cm. high, branching irregular, below 

 mostly dichotomous, with wide forkings ; above partly similar, 

 partly lateral, patent, often at a right angle ; ultimate ramuli 

 i-3-celled, nearly or quite at right angles, often secund on the 

 outer side of a recurved branch. Cells below 70-100 p. diam., 

 2-5 diam. long, cylindrical; in the ramuli 60-80 p. diam., 2-3 

 diam. long, somewhat swollen with constricted nodes; terminal 

 cell obtuse. Bermuda. 



Growing in similar places to C. repens, and forming similar 

 matted tufts, but distinct by the smaller dimensions and the 

 lateral, secund, submoniliform ramuli. 



60. C. hemisphaerica N. L. Gardner, sp. nov. Frons parva, 

 compacta, hemisphaerica, radii ad i cm. ; ramificatione dicho- 

 toma, densa ; dichotomiis angustis; cellulis 60-150 p. diam., 3-6 

 diam. longis, saepe manifeste clavatis ; postea minus regulariter 

 hemisphaerica, ad 3 cm. alta, ramis distantioribus, superiorum 

 cellulis 50-80 p. diam., cylindricis. Aliquando e fronde hemi- 

 sphaerica exsurgunt fasciculi longi, tenues, cellulis cylindricis, 

 50-80 p. diam., dichotomiis longe distantibus, perangustis. 

 Substantia chartacea, minus adhaerente. 



Frond at first compact, hemisphaerical, of not over i cm. 

 radius, branching at base dichotomous, dense, forkings narrow, 

 cells 60-150/1 diam., 3-6 diam. long, often distinctly clavate ; 

 later less regularly hemispherical, up to 3 cm. radius, branches 

 more distant, with cells in the upper part 50-80 p. diam., cylin- 

 drical. Sometimes there arise from the hemispherical frond 

 long, slender tufts, with cylindrical cells, 50-80 p. diam., fork- 

 ings very distant and narrow. Substance firm, not adhering 

 well to paper. 



On rocks and in pools, middle and upper literal zone, Monte- 

 rey County, California. Type No. 3359 in herb. N. L. Gard- 

 ner, from Cypress Point, June, 1916. 



