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have gemmae of the type which grow to a specific size and are then shed before 
germination commences. 
Description of Radula obconica 
Radula obconica Sullivant. Gray’s Manual, Ed. i, 1848. 
Delin. Gray’s Manual, Ed. 2, 1856. 
Exsic. Aust. Hep. Bor. Amer. no. 88. 
Monoicous, small, dark olive-green, coloring-matter imparting a yellowish 
green tint to water, like other Radulae, rather stiff, growing upon damp rocks 
or bark. Stem about 1 cm. long, indefinitely pinnate-branching. Stem-leaves 
hardly imbricated, almost flat, conduplicate, nearly horizontally spreading, 
very ovate, 0.86 mm. long, 0.65 mm. wide, apex obtuse, free about halfway 
to base and covering the stem. Lobule small, subquadrate, 0.27 mm. long, 
0.23 mm. wide, obliquely truncate at apex, with an obtuse or acute angle at 
base, entirely adnate, upper margin (parallel to the stem) 0.2 mm. long, keel 
obliquely spreading, slightly arched, 0.4 mm. long, with smooth sinus termin- 
ating at the margin of the leaf. Leaf-cells hexagonal, upper 18^ in diameter, 
basal a little longer, trigones almost none. Perichaetial bracts a little larger 
than the stem-leaves, spatulate, with rounded apex, lobule shorter, very simi- 
lar, apex truncate. Perianth with innovations on each side, clavate-oblong, 
2 mm. long, mouth repand, entire, shortly bilobed. Perigonial bracts hypogy- 
nous, bracts in few pairs, deeply saccate, upper lobe rather gradually rounded, 
the under lobe very shortly truncate. Vegetative reproduction by means of 
caducous brood-leaves producing leafy shoots. 
Habitat. Wet rocks, or tree trunks. 
Distribution. Somewhat more southerly than the common species, 
according to the material in the herbaria of Dr. Evans, the New York Botanical 
Garden and the writer. Stations are as follows: 
Vermont: Liana Falls, Salisbury. (A. L.). 
Massachusetts: Bare Rock Falls, Sheffield. (A. L.). 
Connecticut: Litchfield: Watertown, (A. L.); Fairfield: Redding, (Evans); 
New Haven: Mt. Carmel, (Evans), Hamden, (Evans), New Haven, (Evans), 
North Branford, (Evans), Oxford, (Harger), Guilford, (A. L.); Middlesex: Kil- 
lingworth, (Nichols); New London: North Stonington, (Evans). 
Pennsylvania: Delaware Water Gap, (Garber). 
New Jersey: “Rare,” (Austin). 
District of Columbia: Washington, (Holzinger); Georgetown, (Coville). 
Virginia: Nicks Creek, (Mrs. Britton and Miss Vail). 
North Carolina: Salem. 
Georgia: Tallulah and Toccoa Falls, (Underwood and Seymour). 
Ohio: Champaign County, (Miss Biddlecome); Columbus, (Sullivant). 
Arkansas: Boston Mts., Swain, (W. H. Emig). 
R. obconica produces caducous brood-leaves in precisely the manner de- 
scribed by the writer in 1912 in Frullania ( 2 ), except that rhizoids have not 
been observed on the shed leaves. These leaves are “Briichblatter”, and not 
“Brutblatter”, as they do not break off at any particular place. Goebel ( 1 , p. 
674, f. 632) figures a Radula from Brazil which has similar leaves breaking off 
at a specific spot. 
