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: i î PH AS CUM CRASSINERVIUM.
Broad-nerved Phascum.
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Class and O k d e r CRYPTOGAMIA MUSCI, i i™ ._ N A T . O r d . MUSCI, Juss.
De Cand.
GENERIC CHARACTER.
Operculum persistens. Calyptra brevis, fugax.
Lid persistent. Calyptra short, fugacious.
SPECIFIC CHARACTER.
P h a s c u m crassinervium ; caule nuUo, foliis lineari-lanceolatis dentatis, nervo
crasso, latoque, excurrente, capsula subsessile.
P. stem none, leaves linear-lanceolate, toothed, the nerve thick, broad, and
excurrent, capsule subsessile.
P h a s c um c r a s s in e rv ium , Schmaeg. Suppl. I. p . 4. t. 2 .—Nees ^ Hornsch.
Bry. Germ. v . J. p . 40. t. 4. f. 3.
H a b . In a fallow field (on a light limestone soil) by the side of Bedford
Purlieus, near Wansford, Northamptonshire, Dec. 13. 1827, Rev. M. J.
B e r k e l e y .
Plant minute, being only a little larger than P . serratum. Stem almost none,
occasionally throwing out a few confervoid shoots. Leaves; the outer
ones often spreading or slightly recurved, the inner ones erect, lanceolate,
linear-lanceolate, or even lanceolate-subulate, rigid, largely reticulated,
the upper h a lf vaguely toothed, furnished with a thick broad nerve,
which is either percurrent or excurrent, and of a dark green colour.
Seta erect, exceedingly short. Capsule globose, brown, with a short,
oblique, obtuse apex. Calyptra short, very fugacious. Seeds large,
globose, reticulated.
It is to the Rev. M r B e r k e l e y that we owe the discovery
of this very interesting moss, specimens of which he kindly
communicated to me, along with some other novelties, which,
to my regret, the termination of this work will prevent me from
recording in its pages. Till very recently, Phascum crassinervium
was supposed to be confined to America, where it was originally
discovered by M u h l e n b e r g . It has been now added