. The Characeae of America. II I apparent relationship to it, being similar chiefly in being dioecious and having fruit enveloped in jelly. Explanation of Plate.—Fig. I, female plant more elongated and diffused than Fig. 2, a male plant more contracted; Fig 3, male terminals x 25 ; Fig. 4, female terminals x 25 ; Fig. 6, oospores x 50; Fig. 5, surface of same highly magnified. N. PR^LONGA, A. Br.—Die Characeen Afrika's, Berlin, 1868 (name only); description in Braun-Nordstedt " Fragmenta" etc., 1882, with figures. (N. gelatinosa v. gigantea, Halsted, Charac. Americ. p. 174, 1879). Th
. The Characeae of America. II I apparent relationship to it, being similar chiefly in being dioecious and having fruit enveloped in jelly. Explanation of Plate.—Fig. I, female plant more elongated and diffused than Fig. 2, a male plant more contracted; Fig 3, male terminals x 25 ; Fig. 4, female terminals x 25 ; Fig. 6, oospores x 50; Fig. 5, surface of same highly magnified. N. PR^LONGA, A. Br.—Die Characeen Afrika's, Berlin, 1868 (name only); description in Braun-Nordstedt " Fragmenta" etc., 1882, with figures. (N. gelatinosa v. gigantea, Halsted, Charac. Americ. p. 174, 1879). This species appears to be the largest known Nitella, collected by Dr. Ravenel in the " Santee Canal" South Carolina, in 1853, a few specimens of which exist in the collections of Engelmann (Missouri Botanical Garden), Gray, at Cambridge, Mass., and of Braun, in Ber- lin ; also collected by Lindheimer in Texas, summers of 1847 ar>d 1848, "in three creeks between the upper Guadaloupe and Pierde- nales, often at a depth of ten ; The stems attain a diameter of 2 to 3 mm. and a length of several feet (4 to 6 or more). The internodal cells are often 6 to 8 inches long, the nodes bearing verticils of long sterile leaves, which below are nearly as large and long as the stems, becoming smaller above. The leaves are simple and terminate abruptly in a mucroni- form point. Braun in his "Fragmenta " states that the young leaves terminate in a cluster of minute short leaves which are not readily noticed, and which fall off when old; the accompanying cut is copied from his figure. I have not observed these minute terminal leaflets, partly due, perhaps, to a desire to avoid mutilating the few specimens I have been able to examine. From the upper verticils, pedicils arise which bear verticils of minute leaves which are once divided and bear both antheridia and sporophydia; the pedicil abruptly diminishes as the first verticil of fertile leaves appears, a
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