70 DICTYOTACEAE 
Nat. Pflanzenfam. 17: 206. 1806. 
Polypodoidea Stackh. Мет. Soc. Imp. Nat. Moscou 2: 96, 97. 
18 
09. 
Halyseris Ag. Sp. Alg. т: 141. 1820. J. Ag. Till Alg: Syst. 2: 
131. 1880; Anal. Ар. Cont. І: 42. 1804. De-Toni, Syll. 
Alg. 3: 253. 1895. 
Neurocarpus Cokeri sp. nov. 
Brownish-green, 30—40 cm. long, arising from a short stupose 
base 2-3 mm. in diameter, the costa tomentose for 3-8 cm., then 
naked, percurrent or evanescent towards the apices, 4-8 times sub- 
dichotomous, the forkings mostly at angles of 30—45°, the main 
segments 15-45 mm. broad; lamina very thin-membranous and 
friable, 30-125 и thick, often perforate, subpersistent below, form- 
ing narrow wings for 2-8 cm. in basal parts, usually 4 cells thick, 
but often with more or less broad uni- or bistratose borders, the 
margins subentire or here and there irregularly ciliate-dentate, 
toward the apices commonly subpinnately much lobed, lacerate, 
incised, or erose, or often with linguiform proliferations; veins 
wanting or very rudimentary; trichomes from the lamina deficient 
or rare; cells of the surface of the mature lamina mostly sub- 
quadrate-oblong, 40-96 и X 27-55 и, those of the surface of the 
costa usually a little narrower, all with very numerous subspheric 
chromatophores; cells of the interior of lamina 27-96 и X 22—27 Ш 
in cross section, with scattered chromatophores; costa 0.25-1.25 
mm. wide, 4-16 cells in maximum thickness; oogonia scattered, 
single ог in groups of 2-5, ellipsoid, cuboid, or subspheric, | 
95-137 и X 40-68 и. [PLATE 13, FIGURES 5-9; PLATE 27.) 
Bay of Sechura, April 10, 1907, Coker 170; а single plant 
dredged in about 10 m. of water. Тһе color of the plant, as it 
comes to us, is a bright almost ulvoid green, but this character has 
doubtless undergone modification through the action of the pre- | 
serving fluid, for Dr. Coker's notes refer to the specimen as . 
“brownish.” 
Neurocarpus Cokeri, in point of size, ranks with the largest 
species of the genus, such as N. Justii (Lamour.) Kuntze, N. 
М фи =. 
recognized laws of nomenclature апа enjoys a priority of four years and inasmuch as 
recent usage has favored Haliseris (or Halyseris) rather more than Dictyopteris, there | 
seems to be in this case at least no valid and sufficient reason why the law of priority 
