682 CXLV. LYCOPODIACEJE. [ Psilotum. 
Rhizome short, intrieately branched. Stems erect or pendulous when 
on trees, from 3 or 4 in. to above 1 ft. long, repeatedly dichotomous in 
the upper c the fertile branches 3- angled, the barren ones usually 
flattened.  Seale-like leaves minute and subulate, the bracts subtend- 
ing the Sette equally small and distant but forked. Capsule- 
like sori globular, about 1 line diameter, attached to the bract below 
the fork.—R. Br. Prod. 164; Hook. Gen. Filic. t. 87, Filic. Exot. t. 63. 
Queensland. Rockingham Bay, Dallachy; Rockhampton and neighbourhood, 
Bowman, O Shane esy ; Moreton Bay and other localities in South Queensland, W. 
Hill, F. Mueller and o 
thers. 
N. G Port Jackson si u* Blue Mountains, R. Brown, A. Cunningham 
and many others; New England, uart; Macleay River, Risger ald ; Richmond 
River, Mrs. Sod Pinain y Lord owes dila C. Moore, Fitzg 
In most tropical or subtropical moist regions in the New and the Old World, more 
rare in Africa, 
2. P. complanatum, Swartz; Spring, Monogr. Lycop. i 
Stems Few as in P. triquetrum, but usua ally longer d pene 
and the fruiting branches as well as the whole stem flat, varying from 
1 to 2 lines broad, rigid or flaccid, the margins alternately notched. 
ves and bracts very minute or almost obsolete. Capsule-like sori 
smaller than in P. triguetrum.——P. flaccidum, Spring, |. c. 
Queensland. Rockingham Bay, Dallachy ; Bowen, Woolls. 
Also in tropical Asia and America, the Mascarene and Pacific Islands. 
Order CXLVI. MARSILEACEJE. 
the involucre (ż.e. on the under surface of the recurved frond), each 
sorus enclosed in a yen ier s indusium, apparently dividing the in- 
voluere into as many ce 
oer Order is limited to the two Australian genera, both of which have a wide 
in the New as well as the Old World. They might well be regarded as form- 
i alli i 
not seen F, Mueller's collecti is order ie the Kew Herbarium contains 
thentic specimens of most of A. ins aun’s s 
Barren fronds with a 4-foliolate lamina. Sori several often 
cese eg v dg hr veins within the Lela 1, MARSILEA- 
Barren fronds Sori ripae dl their indusia dividing the 
pohar ie sae into 4 cells. Aquatic plant . . 2, PILULARIA. 
