The English flora - SeaweedAfrica

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70 MUSCI-PLEUROCARPI-PERISTOMI. [Leucodon.
Schwaegr. Suppl. v. 1. p. 105. Hobs. Br. Mosses, v. 1. n. 26.
Muse. Brit. ed. 2. p. 74. t. 14. Pterigynandrum gracile, Hedw.
St. Cr. v. 4. t. 6.— Grimmia ornithopodioides, Mohr.—Hypnum
graeile, Linn.—Dill. Muse. p. 41./. 55.
Rocks, in subalpine and hilly countries, frequent. Fr. Winter.—
careful examination of good specimens of the fruit of this plant will
bring to view something like an inner peristome, a narrow membrane,
similar to that which unites the base of the cilia of Neckera, yet terminating
so irregularly as not to justify us in placing this among the mosses
which have a double peristome.
3. P. filiforme, Schwaegr. (filiform Pterogonium); stems
irregularly branched curved, leaves ovate subacuminated concave
their margins recurved serrated, nerve single or forked
short faint, lid conical. Schwaegr. Suppl. v. 1. p. 100. E. Bot.
t. 2297. Muse. Brit. ed. 2. p. 75. t. 14 pterigynandrum filiforme,
Hedw. St. Cr. v. 4. t. 7. Pterogonium cwspitosum, E. Bot.
t. 2526. Hypnum cylindricum, Dicks. Cr. Fasc. 2. p. 12. Fl.
Brit. p. 1280.
Rocks, upon the mountains of Scotland and Ireland. Fr. Summer.
—In this and the preceding species, the leaves are closely imbricated
and subsecund, but the present plant is much the smaller of the two and
more irregularly branched. The cellules of the leaves are larger than in
P. graeile, and project on the back and at the margins, which give the
foliage a papillose appearance, as in Hypnum catenulatum, H. proliferum,
and a few others.
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33. Leucodon. Schwaegr. Leucodon.
Seta lateral. Peristome single, of 32 teeth, closely united in
pairs. Calyptra dimidiate. (Muse. Brit. t. 2.)—Named from
Xevstog, white, and oduv, a tooth, on account of the pale-coloured
teeth of the British species, the one on which the Genus was
founded.
1. L. sciuroides, Schwaegr. (Squirrel-tail Leucodon); leaves
closely imbricated ovato-cordate acuminated striated, capsule
oblong. Schwaegr. Suppl. v. 2. p. 1. Hobs. Br. Mosses, v. 1.
n. 51. Muse. Brit. ed. 2. p. 112. t. 20.—L. Morensis, Schwaegr.
Suppl. v. 1. P. II. p. 2, and v. 2. P. I. t. 125.—Dicranum
sciuroides, Sw.—Fl. Brit. p. 1215. E. Bot. t. 1903 Trichostomum
sciuroides, Mohr.—Pterogonium sciuroides, Turn. Muse. Hib.
p. 32 Hypnum sciuroides, Linn—Dill. Muse. t. 41. /. 54.
Frequent on trunks of trees, in England ; rare in Scotland. Fr. (very
scarce) Summer.—Stems long, creeping on the bark of trees. Branches
ascending, often tumid, when it becomes the L. Morensis of Schwaegr.
Leaves concave, those of the perichcetium long, cylindrical, sheathing,
especially the inner ones, which are half as long as the fruitstalk, and
which closely envelope it :* this latter is about an inch long. Lid rostrate.
The perfect fruit has rarely been gathered but by C. Lyell, Esq.
in the New Forest, Hants, and by Mr. Borrer in Sussex.
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