Notes on Pacific Coast Marine Algae VII
1945; Southern California Academy of Sciences; Volume: 44; Issue: 1 Linguagem: Inglês
ISSN
2162-4534
Autores Tópico(s)Marine and coastal plant biology
ResumoSTUDIES of the algal collections from Pacific Mexico currently being assembled at the Allan Hancock Foundation Herbarium continue to give data permitting an expanson of our knowledge of the marine flora of this region. Some of these data are herein reported. STRUVEA DE LICATULA Kutzing.-Material which appears to be typical of this species, first described from New Caledonia, was found in the innermost, protected area of Bahia de Acapulco, Guerrero, Mexico in February, 1947, Dawson 3898. The plants occurred among small Amphiroa colonies on rocks slightly submerged at low tide. Though the species is known to occur widely in tropical seas, it has not hitherto been reported from the Pacific American coast. The plant is well illustrated by Okamura (1908) and by Murray and Boodle (1888). DICTYOPTERIS MEMBRANACEA (Stackh.) Batters. -Several northwest Mexican specimens are now at hand which seem indistinguishable from examples of this species both from the Mediterranean region and from the northeastern Atlantic. The broad, uniformly and sparsely dichotomously branched membranous blades which are often eroded in the lower parts leaving the slender, wiry midrib, are distinctive of the plant. The following collections represent the first records of this species from the northeast Pacific: Hubbs 46-145, Isla Guadalupe, Baja Calif., Dec., 1946; Williams, April 27, 1946, Isla Conche, and May 5, 1946, Laguna de Scammon, Bahia Viscaino, Baja California. GYMNOGONGRUS HANCOCKII Dawson, 1944, p. 300. Gymnogongrus divaricatus Holmes, as interpreted by Dawson, 1944, p. 301. (fig. 1).-Recent collections of this species from twenty stations in the Gulf of California and from central Sinaloa have demonstrated clearly its abundance, wide range, and exceeding variability in size and degree of proliferation. The type specimens, though fertile, prove to be among the smallest of any of the collections made to date, some of the more ample specimens now at hand being fully ten times as great in stature. The availability of the entire series of specimens (numbering more than 200) also shows that the examples interpreted by Dawson (1944) as G. divaricatus actually represent the larger, broader form of G. Hancockii such as has been found at Puerto Libertad and at Isla Alcatraz. The occurrence of reproductive structures in the
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