base of bifid bracts, wbicb resemble the leaves in texture. Sparse
oblong, rather curved, with a single apical rib. A single species.
T. TANNBNSis Beruli. ill Schrad. Journ. 1800, ii. 131, tab. 2,
fig. 5 ; Labill. PI. Nov. Holl. t. 2 6 2 ; Hook, et Bauer Ic. F il. t.
80. T. Forsteri and Billurdieri Eiidlich. BsUotum tnmaitum
B. Br. —Eootstock creeping. Steins usually simple, | - 2 ft. long,
slender, angular, naked towards the base. Leaves moderately lax,
lanceolate or oblong-lanceolate, produced on the upper side in the
lower half, obtuse, mucronate, 4 -1 hi. long, with a distinct midrib
and decurreut base. Bracts taking the place of ordinary leaves,
deeply bifurcate, shortly petioled. Sporangia 4 - 4 in. loug.
Hab. Australia, New Zealand and Polynesia.
4. PsilotdmH-- S w .
Sporangia rigidly coriaceous, turbinate, mubilicate at the apex,
8-lobed, 8-celled, splitting vertically down the centre of each lobe,
placed singly free in the axils of rudimentary leaves all down the
branches. Spores oblong, rather curved, one-ribbed. Uootstock
wiry, short-creeping. Stews simple in the lower half, copiously
dichotomously branched upwards. Leaves minute, laxly disposed,
trifarious or distichous.
1. P. TEIQUETRUM Sw. Syii. F il. 117; Schk. Crypt, t. 1656;
Hook, et Bauer, Gen. F il. t. 87 ; F il. E x o t. t. 63. P . floridanum
Michx. F. dichotomum Link. P . nudum Griseb. Bernhardia
dichotoma Willd. Lycopodium nudum Linn.— Whole plant 4 -2 ft.
loug, erect or suberect ; branches triquetrous, many times
dichotomously forked, the ultimate branchlets 4 - 4 lin. diam.
Leaves placed laxly on the angles of the branchlets, ovate, very
minute, ascending, rigidly coriaceous. Bracts a little smaller than
the proper leaves.
Hab. Troirical regions of both hemispheres, extending to Florida, Japan,
and New Zealand. P. capillare Blume is a variety with indistinctly triquetrous
branchlets. I include here Bernhardia foridana, rnariana, capensis, antillarum,
indlca, novee-hollandiai, mascarenica, oahuemis and Deppeana of Karl Muller.
2. P. COMPLANATUM Sw. Syn. F il. 188, 414, tab. 4, fig. 5 ;
Schk. Crypt, t. 165 b. P. flaccidum Wall. P . ZolUrujeri Cesati.
Bernhardia complanata, Schiedeana califorciea, ramulosa and Zollin-
yeri K. Muller.— General habit of P . triquetrum but pendulous and
more laxly branched, the ultimate branchlets flat, with a distinct
midrib, l-1 2 th to 16th in. broad, and the leaves and sporangia
arranged distichously.
Hab. Similar in its distribution to the other species, but less common.
P. flaccidum Wall, is a large lax variety, with broader branchlets th a n the type.
* For further _ information see an elaborate memoir by Count Solms
Laubach, in vol iv. of the ‘Annals of the Botanic Gardens of Buitenjorg,’
p. 139, tabs. 18—23; and a paper by Karl Muller in Bot. Zeit. 1856, pp. 217,
233, tab. 7.
Order 3.— SELAGINE LLAOEÆ.
Sporangia of two kinds, maorosporaiigia and microsporangia,
not contained iu any exterior wrapper, but placed in the axils of
altered or unaltered leaves upon a produced or condensed stem,
either free or imbedded in their substance, dehiscent or indéhiscent,
moiioicous or rarely dioicous. Microspores very minute, dust-like,
always very many iu one microsporangium. 2lacrospores much
larger, globose, generally clialk-white, few or many to each macro-
sporangium, furnished with three ribs which radiate from tho apex
and developing a minute female prothallium, which remains
permanently attached to the spore. Two genera of very different
habit.
1. S e l a g in e l l a (P . B.) Spring.’^'
Sporangia minute, orbicular, laterally compressed, membranous,
1-celled, inserted in the axils o f bracts so as to form a dense spike
at the end of the leafy branches, the microsporangia numerous,
the maorosporaiigia few and confined to the base of the spike.
blicrospormujia slitting across the top of the broad diameter, containing
numerous dust like microspores. Macrosporangia usually
also 2-valved, containing four or fewer macrospores.— Habit entirely
of Lycopodium, from which it differs by its dimorphic spores and
sporangia, some of the species small and fugacious, resembling
Hepaticoe, with not more than two vascular bundles in the main
stem. Stems copiously branched, the ultimate branching usually
flabellato-dichotomous, trailing, suberect, sarmentóse or scandent,
with the root-fibres confined to the base, or in the trailing species
extending to the upper notes ; in shape more or less distinctly
quadrangular, the faces angled (stems goniotropous. Spring) or the
flaces flat (stems pleurotropous. Spring) ; nodes sometimes distinctly
articulated. Leaves small, furnished only with a single
central vein, usually tetrasticlious and dimorphous, and more or
less oblique, the two rows f of the lower plane larger and more
spreading, the two rows of the upper ascending, adpressed to the
stem and imbricated ; in the subgeuus Ruselagitiella multifarious,
or, if tetrasticlious, all alike. Spikes usually tetrasticlious and
often sharply square, but in two subgenera dimorphic on the same
plan as the leaves, but mostly resupiiiate [i. e., the small bracts on
the same plane as the large leaves, and vice versá).
* For further information see Siiring’s elaborate Monograph in vol. 24 of the
‘ Memoirs of the Eoyal Academy of Belgium ’ ; Hooker and Greville’s “ Enumeration,”
in Hooker’s ‘Botanical Miscellany,’ vol. ii., p. 360, and vol. ill., 104 ;
A. Braun’s papers in the Eeports of the Berlin Garden (especially th a t reprinted
in Ann. Sc. Nat., 4th series, vol. 13. p. 54) ; ï r i a n a and Planchon’s ‘ Cryptogamia
of New Granada ’ ; Kuhn’s ‘ Filices Africanæ ’ ; and in ‘ Monatsbericht der K,
Preuss. Akad.,’ April, 1865, pp. 186—209. This synopsis is reprinted, with
additions and alterations, from B ritte n ’s ‘ Journal of Botany,’ 1883—5.
t Spring distinguishes in the dimorphic-leaved species between folia synedra,
in which the leaves are inserted on the angles of the stem, and folia cathedra,
in which they are inserted on its faces.