(275 ) 
twice as long as the succeeding internodes, which are about the 
same length as one another, a little narrower than the uncorticated 
one, doubly corticated except the terminal one or sometimes two; 
leaflets 6-8 at all nodes, at fe fertile 7 or 8, at the uppermost still 
6, which are almost as long as the apical cell of the leaf, the lower 
ones somewhat shorter and narrower than the leaf-inter nodes, about 
twice as long as the sporocarps, not ventricose, wider than the 
spine-cells: antheridia 0.2-0.22 mm. in diameter ; sporocarps some- 
what oblong, about 0.6 mm. long, 0.36-0.38 mm. wide; odspores 
black, 0.38-0.4 mm. long, 0.28-0.3 mm. wide. 
Type locality: Potrero de Ponsoquitla, near Mirador, Mexico. 
Distribution: Mexico to Lagoa Santa, Brazil, fde Braun. 
24. CHara Rossinst Halsted, Proc. Boston Soc. Nat. Hist. 20: 
183. 1879 
Cc. pilge Sie septentrionalis Nordst.; Allen, Char. Am. Exsicc. 
C. a. majuscula Nordst. in A. Br. Fragm. Monogr. Char. 
134, in part. 1882. 
? C. nudifes Wallm. Kongl. Vet.-Akad. Handlingar 1852: 293. 
1854. If so, the oldest name. 
Monoecious : 9-18 cm. high, somewhat yellowish-gr een, slightly 
or moderately incrusted ; stems 0.3-0.9 mm. in diameter, essentia ally 
node in the other, the cortex thus being numerically double and ‘so 
appearing if viewed casually; cortical cells usually long, spine-cells 
therefore distant, usually 0.6-1 mm. long, 0.0g-0.1 mm. wide: stipu- 
long, the whorls distinct or somewhat overlapping at the apex, 
each leaf containing 6 or 7 internodes, the lowest internode of 
variable dimensions, 1-3 mm. long, 0.16-0.55 mm. wide, uncorti- 
cated, always wider, usually much so, than the succeeding ones, of 
whi ch the next 2-5 are doubly corticated, leaving 1-3 uncorticated 
apical ones; leaflets of any whorl su equal, re 1.2-1.5 mm. 
long, 0.11-0.16 mm. wide, about twice the length of the mature 
sporocarps, the terminal leaflets about two-thirds this length: 
antheridia 0.23-0.3 mm. in diameter; sporocarps 0.73-0.8 mm, 
high, o.1-0.18 mm. wide at base, the individual cells ovate, some- 
what erect or very widely spreading. 
Type locality: Apponaug Pond, Rhode Island. 
