Musci Exorict. 
LEUCODON RUGOSUS. 
Leucodon caule repente, ramis erectis subsimplicibus, 
foliis ovato-lanceclatis transversim rugosis, nervo at- 
tingente, perichzetialibus setam omnino vaginantibus 
attenuatis nervosis, capsula cylindracea erectiuscula 
striata, ore horizontali, operculo subulato. (Tas. XX.) 
Has. In Nova Hollandia. Turn. Herb. a Dicksonio missus. 
Caulis repens, valde ramosus, ramis erectis, simplicibus vel inno- 
vationibus rarius divisis, teretibus, incrassatis, apice obtusis. 
Folia densissime imbricata, erecto-patentia, ovato-lanceolata, 
concava, fusco-lutescentia, nitida, transversim rugosa, mar- 
gine integerrima, superne involuta, nervo distincto ad apicem 
attingente instructa. Perichetialia magna, flavescentia basi 
aurantiaca, nervo distinctissimo, a basi ad apicem usque attin- 
gente, instructa: ext. minora, late ovata, anguste attenuata 5 
int. longissima, setam superantia atque vaginantia, apice atte~ 
nuata. Sef laterales, non raro bine ex eodem perichetio- 
Capsula rufo-fusca, cylindracea, erecta, vel leniter inclinata, 
stricta, estrumosa, ore transverso. Operculum subulatum. 
Perisiomii dentes 16, flavo-rufescentes, graciles, transversim 
striati, profunde bifidi, segmentis linea media longitudinali 
notatis iterumque apice divisis, 
Under Leucodon calycinus 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; in the hori- 
zontal (not oblique) mouth; in the lid, which wants the gibbosity 
at the base; and above all in the perichetial leaves, which besides 
being much attenuated at the extremity are furnished with as 
distinct a nerve as those of the stem. 
Fig. 1, plant mat. size. Fig. 2, leaf. Fig. 3, perichetium 
and capsules. Fig, 4, exterior perichetial leaf, Fig. 5, inner 
ditto. Fig. 6, teeth of peristome,—magn, 
