Tmesipteris.] LYCOPODIACEA. 1041 
1. T. tannensis, Bernh. in Schrad. Journ. Bot. ii. (1800) 131, 
t. 2.—Stems 4-18 in. long or more, simple or rarely once or twice 
forked, usually pendulous, slender, naked towards the base. 
Foliage-leaves rather closely placed, 4-lin. long, obliquely oblong 
or oblong-lanceolate, sessile and strongly decurrent at the base, 
obtuse or truncate or acute at the tip, the midrib usually produced 
into amucro of variable length, coriaceous, dark dull-green. Fertile 
leaves rather shorter than the foliage-leaves and replacing them at 
intervals down the stem, on short petioles sometimes +in. long, 
deeply 2-partite, the divisions usually similar to the foliage-leaves 
but smaller. Synangia sessile or very shortly stalked, 14in. long, 
parallel to the petiole, brown, coriaceous. — Benth. Fl. Austral. 
vii. 680; Bak. Fern Allies, 30. T. Forsteri, Endl. Prodr. Fl. Nor- 
folk. 6; A. Cunn. Precur. n. 151; Raoul, Choix, 37; Hook. f. Fl. 
Nov. Zel. ii. 51; Handb. N.Z. Fl. 391; Thoms. N.Z. Ferns, 108. 
T. truncata, Desv. in Ann. Soc. Linn. Par. vi. 192; Hook Gen. 
Ferns, t. 86. 
KeRMADEC Isi~anps, NorTH AND SovutH Isnanps, CHaTHam Isxanps, 
StEWwakrT IsLanD, AUCKLAND IsLaNps: Common in forests throughout, usually 
epiphytic on the stems of tree-ferns, more rarely on rocks. Sea-level to 
3000 ft. 
For a discussion on the morphology and systematic position of this plant 
see Professor Bower’s memoir ‘‘On the Morphology of the Spore-producing 
Members’”’ (Trans. Roy. Soc. 1894, p. 541-548) and the more recently pub- 
lished paper by Professor Thomas entitled ‘‘ The Affinity of T’mesipteris with the 
Sphenophyllales ’’ (Proc. Roy. Soc., Vol. lxix., p. 343-350). 
4. PSILOTUM, Swartz. 
Rhizome short, creeping, branched; true roots wanting. Stem 
erect or pendulous, simple below, repeatedly dichotomously 
branched above; branches angled or flat. Leaves very minute, 
seale-like, laxly placed, trifarious or distichous. Sporangia (or 
synangia), coriaceous, almost globular, usually 3-lobed and 3-celled, 
rarely 2- or 4-celled, in the axil or attached below the fork of a 
minute bifid scale-like fertile leaf or sporophyll, which is either 
sessile or raised on a short petiole. Spores minute, oblong, curved. 
A small genus of two species, widely distributed in the tropical and sub- 
tropical regions of both hemispheres. The New Zealand species has the range 
of the genus. 
1. P. triquetrum, Swartz, Syn. Ful. 117.—Stems 4-18 in. long, 
erect or pendulous when growing on trees, stout or slender, simple 
below, many times dichotomously branched in the upper part ; 
branchlets triquetrous, the ultimate ones ,—,in. diam. Leaves 
placed on the angles of the stems and branches, distant, minute, 
scale - like, ovate-subulate, j,-1in. long. Fertile leaves bifid, 
rather smaller than the foliage-leaves, sessile or shortly petiolate. 
Synaugia ;—;, in. diam., globose or broader than long.— Hook. Gen. 
