1879.] 179 [ Halsted. 
The species is a rather constant one, though some slight variations 
are noticeable. In Herb. Gray the specimens from Lousiana had but 
few leaves in the scattered whorls; those collected by Prof. E. 
Tuckerman in the White Mountains are diminutive, as also are those 
from Utah. The Tewksbury, Mass., specimens resemble those 
gathered by Mr. Wright in Leom River, Texas, being in size be- 
tween the small specimens just mentioned and the large and showy 
plants of Boxford, Mass., (Robinson). A loose form of the species 
is found in Wading River, (Dr. Robbins). The same gentleman has 
collected the normal form at Uxbridge and Northbridge, Mass. 
2. Genus ToLYPELLA A. Br. 
Plants monecious; leaves with 2—3 nodes bearing primary leaflets. 
Antheridia lateral, often with long basal cell. Sporangia in clusters. 
Tolypella nidifica (Ag.) A. Br. 
Tolypella nidifica A. Braun, in Krypt. Fl. Schlesien, 366. 
Nitella nidifica Agardh, Syst. Alg., 125; Kiitz., Phyec. gen., 
318; Phyc. germ., 255; Sp. Alg., 517. Chara nidifica Roth., 
Catal., 11, 26. 
Exsiccatae: Braun, Raben. and Stiz. Char. Exsic., 32 and 61, 
Illustrations: Kiitz.,-Tabulae Phycol., vir, Tab. 37; Fl. Dan. Vc. 
Tab. 741; Engl. Bot., xxiv, Tab. 1703. 
Plants monecious, much branched; whorls compound, remote; 
secondary whorls dense and fertile, forming heads composed of short 
scythe-shaped leaflets. Antheridia lateral and frequently long stalked. 
Sporangia nearly spherical, small, .38—.45 mm. long, 6—7-striate. 
The Gray collection furnishes only one specimen of this species, it 
having been collected at San Rafael, California. The Braun, Raben. 
and Stiz. plants are of the normal form with which ours corresponds. 
This is the only American member of the small genus Tolypella. 
The long stalks upon which some of the antheridia are borne are 
noticeable, and seem necessary where there are so many of these at 
the same joint. 
2. Family CHAREAE. 
Plants moneecious or dicecious; stems and leaves with or without 
cortications ; whorls consisting of from 6-12 leaves; stipular ring at 
base of whorl; bracts of leaves (leaflets) one-celled. Antheridia and 
Sporangia on the upper side of the leaves; crown of one whorl of five 
cells. Spore with a coating of carbonate of lime. 
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