Ser. RuoposPERMEA. Fam. Cryptonemiacer. 
Puate CCLXXXIX. 
CRYPTONEMIA? DECIPIENS, Zar». 
Gon. Cuar. Frond flat, rigid, caulescent, proliferous and branched, formed 
of three strata; the medullary stratum of longitudinal, slender, 
closely interwoven filaments; the ¢termediate of roundish cells; the 
cortical of minute cellules. Fructification: 1, simple favelle, im- 
mersed in the substance of the frond; 2, cruciate ¢etraspores, col- 
lected in roundish sori, either under the apices, or in special fruit- 
leaves.—Cryptonemia (J. dg.), from xpumre, to hide, and vnua, a 
thread ; alluding to the hidden threads of the medullary stratum. 
Frons plana, chartacea, caulescens, prolifera et ramosa, stratis fere tribus con- 
texta; strato medullari filis elongatis longitudinalibus tenuibus dense inter- 
textis, intermedio cellulis rotundatis majusculis, corticali cellulis minimis 
constante. Fruct.: 1, favelle simplices, in frondem immerse ; 2, tetraspore 
cruciatim divise, in soros rotundatos collecta, soris infra apices aut in sporo- 
phyllis propriis positis. 
CrypToneMia? decipiens ; stipes filiform, elongate, continued as a strong 
midrib into the lower segments of the frond; frond many times di- 
chotomous, flabelliform, fastigiate, rigidly coriaceous or horny; seg- 
ments narrow-cuneate, flat, spreading, obtuse, with wide axils; sori 
(young) in the apices. 
C. decipiens ; stipite filiformi, elongato, sursum in frondem ut costa ramosa va- 
lida longe producto, fronde pluries dichotome flabelliformi fastigiata rigide 
coriacea v. cornea, laciniis anguste cuneatis planis patentibus obtusis, axillis 
latis, soris (junioribus) sub apicibus laciniarum, oblongis. 
CRYPTONEMIA decipiens, Harv. in Herb. T. C.D. 
Has. Rottnest Island, Fremantle, W. H. H., G. Clifton. 
Geogr. Distr. West Australia. 
Descr. Root a small disc. Stipes 2-3 inches long, half a line in diameter, very 
rigid and wiry, terete, passing into the base of the frond as a midrib, then 
branching, and prolonged for 2—4 inches or more through the principal 
segments, till it disappears near the summit. ond flabelliform in outline, 
very much divided in an irregularly dichotomous manner, 6-8 inches long, 
and as much or more in the spread of the branches. Segments linear or 
linear-cuneate, constricted at intervals, quite flat, the lateral ones repeatedly 
forked ; axils all wide and blunt; apices obtuse. No mature fruit has been 
seen, but in several apices occur oblong thickenings of the peripheric stra- 
tum, like young xemathecia, and doubtless these are preparations for sori of 
tetraspores. The structure of the frond is very dense, the medullary region 
