Mastico-LEJEUNEA. 105 
toma, foliis oblique ovalibus plerisque rotundatis, foliolis late emarginatis 
repandulis. 
Phragmicoma ligulata, Kurz! (in ins. Banca a Kurz lecta) valde affinis 
est, foliolaque fere exacte conformia. Folia autem duplo longiora quam 
lata, ligulata, interdum subacuta; bracteola angustior carinato-complicata 
eroso- repandula, Perianthia nondum vidi, sec. cl. Lindenberg autem 
tricarinata sunt, caeterum eplicata. 
Suspcenus VII.*—THYSANO-LEJEUNEA. 
Sive Mastigo-Lejeunea, § Thysano-Lejeunea = Thysananthus, Linden. 
Sp. Hep. = Bryopteris, Sp. Nees. 
Hab. Ad arborum humiliorum przecipue truncos ramosque in terris calidis 
eequinoctialibus. 
Instr. Th. L. amazonica, S., per totam planitiem Amazonicam fere tri- 
vialis, habitationum viciniam diligit, in montes nusquam ascendit, 
neque ad Andium pedem oceidentalem visa fuit. Th. L. dissoptera, 
Spruce (Thysananthus comosus, Syn. Hep. quoad stirpem Americanam) 
solum e Guiana anglica possidemus. Tertiam speciem, Th. L. ptero- 
bryoides, 8., haud sine dubio hue relatam, quum plantam masculam 
solum vidi, ad Andium pedem orientalem inven. Quarta species, 
e descriptione videretur, Lejeunea cognata, Nees, e Brasilia allata, 
mihi adhuc ignota.—In regionibus paleotropicis multo magis nume- 
rose videntur species, quarum ipse examinavi Thysananthus comosus, 
Lindenb.! (typus), Th. spathulistipus, Ldng., convolutus Ldng., reni- 
lobus, G.: omnes insulis Malayanis incolas ; alizeque paucz orientales 
enumerantur.—Tres species Novo- Zelandicas, a cel. Taylor ad Thy- 
sananthum adscriptas, e descriptionibus vix congeneres censerem. 
Obs. This group has few representatives in equatorial America, but one 
species, Th. L. amazonica, is perhaps more frequent than any other Lejewnea 
on the Amazon and its tributaries, where it occurs as a weed on old Cala- 
bash and other trees, planted near dwellings. I thought, at first it might 
be a form of Thysananthus comosus, Lindenb., but having now examined 
in Hooker’s herbarium the original specimens on which. “that species was 
founded, I find it quite distinct. Lindenberg’s “ species,” indeed, com- 
bines the characters of two distinct species—the one American, from 
Guiana, the other Asiatic, from Pulo Penang and New Guinea. A careful 
study of Hooker’s specimens has convinced me that the eastern plant, 
Th. L. comosa, Ldng. vera, is a different species from the western, which I 
call Th. L. dissoptera, n. sp. (See below, after Th. L. amazonica.) 
The eastern tropics would seem far richer in species of Thysano-Lejewnea 
than the western. All the oriental agree with the American species in 
habit and texture ; in the form and armature of the perianth ; the crowded 
leaves and flowers ; the very acute and usually toothed leaf-points ; and 
the cuneate emarginato-truncate under-leaves, usually toothed upwards. 
Th. L. spathulistipa differs from all the American species in having the 9 
branches usually dichotomous. 
A. Caules elati, pro more laxe inequaliter pinnati. Folia foliolaque con- 
ferta, apice minute serrulata vel integerrima ; cellule subplane. 
TRANS. BOT. SOC. EDIN. VOL. XY. oO 
