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LEUCODON RUGOSUS.
Leucodon caule repente, ramis erectis subsimplicibus,
foliis ovato-lanceolatis transversim rugosis, nervo attìngente,
pericliíetlalibus setam omnino vaginantibus
attenuatis nervosis, capsula cylindracea erectiuscula
striata, ore horizontali, operculo subulato. (Tab. X X .)
H a b . Ill Nova Hoiiandia. Tuni. Herb, a Dicksonio missus.
Caulis repens, valde ramosus, ramis erectis, simpiicibus vel innovationibus
rarius divisis, teretibus, incrassatis, apice obtusis.
Folia densissime 'imbricata, erecto-patentia, ovato-lanceolata,
concava, fusco-lutescentia, nitida, transversim rugosa, margine
integerrima, superne involuta, nervo distincto ad apicem
attingente instructa. PerichcElialia magna, flavescentia basi
aurantiaca, nervo distinctissimo, a basi ad apicem usqne attingente,
instructa : ext. minora, late ovata, anguste attenuata ;
in t. longissima, setam superantia atque vaginantia, apice attenuata.
Selce laterales, non raro bin» ex eodem perichastio.
Capsula rufo-fusca, cylindracea, erecta, vel leniter inclinata,
stricta, estrumosa, ore transverso. Opercidum subulatum.
Peristomii dentes 16, flavo-rufescentes, gráciles, transversim
striati, profunde bifidi, segmentis linea media longitudinali
potatis iterumque apice divisis.
Under Leucodon calycìnus I noticed a New Holland species,
which is here represented. Besides its larger size, its thicker
branches, yellower colour and rugose leaves, it differs in the
straight capsule, which is destitute of any struma ; iu the horizontal
(not oblique) mouth; in the lid, which wants the gibbosity
at the base; and above all in the perichaetial leaves, which besides
being much attenuated at the extremity are furnished with as
distinct a nerve as those of the stem.
Fig, 1, plant nat. size. Fig. 2, leaf. Fig. 3, periehaetium
and capsules, Fig. 4, exterior perichaetial leaf. Fig. 5, inner
ditto. Fig. 6, teeth of peristome,—magn. i I
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