The morphology of Ruppia maritima

Abstract

BIBLIOGRAPHY 165 EXPLANATION OF PLATES 170 relates to the subject of this paper, and which I have found most helpful in its preparation. Ascherson (1889), in Engler and Prantl's Natiirliche Pflanzenfamilien, cites the most important references bearing on the Potamogetonaceae up to the date of his contribution. Among these, the papers on Althenia by Prillieux (1864), Cymodocea by Bornet (1864), and Zostera by Gronland (1851) are valuable for their contributions to the morphology of these allied plants. In this respect, also, the works of Irmisch (1851 and 1858) are remarkable for the accuracy with which they describe the external morphological relations of R. rostellata and other Potamogetonaceae. Of later works, which are especially useful in a comparative morphological study of the vegetative organs, are, among others, those of Sauvageau (1891, II), Campbell (1897) and Goebel (1898). As to ecological considerations pertaining to water plants, the work of Schenck (1886) deserves especial mention. In the preparation of the parts on the reproductive organs, embryo, &c., the works cited are tdo numerous to mention here, and the reader is referred to the bibliography (p. 165). If we except a rather doubtful reference of Hofmeister, (1861, ascertain, is that of Roze (1894), who describes chiefly the conditions of fertilization, but also presents a valuable historical review of the whole genus. Others, it is true, such as Miss Scott (1906) and Chrysler (1907), have dealt with special features of the plant, in the course of their comparative morphological investigations. Ruppta rostellata, on the other hand, if we piece together the results of various observers, has been pretty thoroughly worked out. First Irmisch (1851 and 1858) described carefully its external morphological characters ; next, Wille (1883) studied the development of the embryo, and quite recently Murbeck (1902) published an admirable paper on the reproductive organs and embryo.The genus Ruppia is aquatic, characterized by its long, linear, grass-like leaves with basal sheaths, and grows in brackish and salt water (but probably never salt water of normal ocean strength, see p. 124), in creeks and bays along the coast and in the neighborhood of inland salt springs, throughout all parts of the temperate and tropical zones. Except at low tide it is completely submerged until the period of flowering, when it produces its flowers a short distance (1-3 cm.) above the surface of the water. The flowers, always two to each peduncle, are borne one above the other, on

The species of Ruppia in New Zealand

“…but a perforation is illustrated by Mason (1957) for Californian material. Graves (1908). in his detailed work on the morphology of "Rllppia maritima" (which in fact dealt partly at least with R .. fpiraIiJ).…”

Perianth Development of Potamogeton Richardsonii

“…(1789), Chamisso and Schlechtendahl (1827), and many other authors in the first half of the 19th century. More recent adherents to this opinion include Hegelmaier (1870), who made aR excellent study on the floral development, Celakovsky (1896), Graves (1908), Saunders (1939), Eames (1961), and a few authors of floras. These authors interpret the questionable organs as perianth segments (Graves, 1908, and others), perigon segments (Hegelmaier, 1870, and others), tepole (Saunders, 1939), sepals (De Jussieu, 1789;Eames, 1961, andothers), or "petaloid structures" (Hutchison, 1959).…”

Observaciones sobre un coportamiento atípico de Ruppia maritima L. en una laguna costera tropical

“…4). Aunque no se ha delimitado el grado de tolerancia de esta especie a la salinidad, existe la opinión entre los distintos autores que se tratá de una especie eurihalina (Graves, 1908;Bourn, 1935;Conover, 1958;Arber, 1963;Fasset, 1969), ya sea en aguas con cloruro de sodio, carbonatos, fosfatos o compuestos de magnesio. Se encontraron tres distintos tipos de suelo de acuerdo con su textura (Tabla 3).…”

“…Algunos autores sostienen que ésta se efectúa en la superficie del agua (Roze, 1894;Graves, 1908), mientras que otros opinan que se realiza dentro del agua (Scultorphe, 1967;Gamerro, 1968).…”