XX. Cinclidotus. Fruitstalks terminal. Peristome single, of 32 filiform twisted teeth, anastomosing at their base. Calyptra mitriform.
This genus was first defined by De Bcauvois, in the Prodrorne ce/Etheogamie. It contains only one species, Cinc. fontinaloides, the Fontinalis minor of Linnxus, and Trichostomum fontinaloicles Iledwig and Stnith. The calyptra is sometimes split on one side.
XXI. Conostorruma. Fruitstalk terminal. Peristome of 16 equiciistant teeth, all united at their summits. Ca lyptra dirnidiate.
This genus was established by Swartz in Schrader's Journal. It contains only one British species, C. boreale, the Grirnmia conostoma of Sir J. E. Smith. It is an al pine moss. Only another specks, C. australe of Swartz, native of Noi th America, at the Streights of Alagellan, is known. Both spccius approach the Bartramix with termin,)1 footstalks, very much in habit.
XXII. Encalypta. Fruitstalks terminal. Peristome Xxii. Encalypta. Fruitstalks terminal. Peristome single, 01 16 teeth. Calyptra campanulate, smooth, en tirely er.closing the mature capsule.
Contains three British species, of which E. strepto carpa is very rare in ft uctification ; in which state it was found by Dr. Hooker, on the Duke of Atholl's grounds at Dunkeld, in 1815. The other two species are common.
XXIII. Weissia. Fruitstalk terminal. Peristorne Xxiii. Weissia. Fruitstalk terminal. Peristorne single, of 16 entire equidistant teeth. Calyptra dimidiate.
Contains 18 British species, of which W. splachnoides, Templetoni, NV. trichocles, W. calcarea, pusilla, are among the most rare. W. Templetoni is peculiar tn Iceland. Five new species are figured in the Musci Exotici.
XXIV. Pterogonium. Fruitstalk lateral. Peristome Xxiv. Pterogonium. Fruitstalk lateral. Peristome single, of 16 entire equidistant teeth. Calyptra dimidiate.
Contains three species, of which P. Sinithii, a spe cies which Sir J. E. Smith gathered almost immediately on landing in England from his travels, and which was not before known to be a native moss, and Pt. tiliforme, are rather rare British species. Our other species, Pt.
gracile, is common. Four new species are figured itt thc Must-. Exot.
XXV. Calymperes. Fruitstalk terminal. Peristome single, of a spongy holizontal membrane, completely covering the mouth, at last divided in the middle into 16 short teeth. Calyptra large, mitriform, involving the capsule, at last divided laterally.
Of this genus, first defined by Swartz, three species are known; of which two, C. lonchophyllum, and C. Palisoti, natives of the \Vest Indies and of Africa, are figured by Schwmgrichen ; the third, C. Garneri, a na tive of Nepal, from which it was sent by the Hon. Col. Garner, is figure(' in the second volume of the illusc. Exot. It is a singular genus, and seems to be confined to warm countries.
XXVI. Grimmia. Fruitstalk terminal. Peristorne Xxvi. Grimmia. Fruitstalk terminal. Peristorne single, consisting- of 16 equidistant teeth, entire or perfo rated, (very rarely split.) Calyptra mitriform.
Of this genus, seven species are indigenous to Britain. Gr. saxicola, Gr. Daviesii, anti Gr. Doniana, are me. Five new species are figured in the Mum Exot.
XXVII. Dicranum. Fruitstalk terminal. Peristome Xxvii. Dicranum. Fruitstalk terminal. Peristome single, of 16 bitid teeth. Calyptra dimicliate.
Contains 24 British species, of which D. latifoliurn, D. longifolium, D. spurium, are the most rare. D. glau cum is rare in fruit. The .illusc. Exot. contain seven new species.
XXVIII. Trichostomum. Fruitstalk terminal. PeXxviii. Trichostomum. Fruitstalk terminal. Pe- ristome of 16 teeth, divided to the base, or 32 approxi mated in pairs. Calyptra mitriform.
Contains nine British species, none of which is pe culiarly rare. The Ilium Exot. contain two additional species.
XXIX. Leucoclon. Fruitstalk lateral. Peristome Xxix. Leucoclon. Fruitstalk lateral. Peristome single, of 16 split teeth, or 32 closely united in pairs.
Only one species of this genus, L. sciuroides, is British, and of it the fruit is very rare. L. canariensis is another species figured by Schwmgrichen; and five new species are fig-ured in the .111118c. Exot.