100 SYNOPSIS OF THE RHIZOCARPES. 
= — microspores, which are aggregated in — 
with a membranous cuticle, and are born 
a hepsnbel filiform yeconisls+ the other kind smaller, ova con- 
taining a single macrospore, which is se ce y few or many — 
float-corpuscles, and has a calyptrate which is pushed off as — 
the archegonium developes.— Fu eres tacking water-plants with 
copiously-branched stems; leaves sessile, minute, densely imbri- 
in ee lobed, each lobe furnished with a midrib only; the — 
stems sending out from the under side into the water copious simple — 
or feathered solitary or fascicled root-fibres 
Subgenus Evazorta Meyen.—Macrospores crowned with 3 float- 
corpuscles. Massule of the microspores armed all round with rigid _ 
glochidiate processes. Root-fibres solitary. Sp. 1-3. 
ubgenus Ruizosperma Meyen. — Macrospores eocued with 
numerous float-corpuscles. Massule of the microspores a armed 
on one side with a few weak prickles without glochidiate tips. 
Root-fibres fascicled. 
Leafy fronds single and crowded . Sp. 4.) aaa 
Leafy fronds placed on a wide- trailing leafless stem Sp. 5. 
1. A. rmicutomes Lam. Encye. i. 848; Kuhn in Fl. Bras. i. 
658, tab. 82, figs. 9-11. — 4. sicialinecia Willd. — 4. Arbuscula 
esv.—Fronds 1-2 in. long, copiously ree a pele 8 green or 
oftan tinted with red-brown, the lar Eek e. Macrospore 
3 float-corpuscles, its cuticle tarnicbad wisi large discoid 
tubercles with deep pits between. assule of microspores fur- 
nished with copious rigid processes, without septa, with a glochiia 
ip. 
“ea South America, enly on the west side, ascending in the 
The 
Andes to 16,000 ft. alpine forms are dwarf, with nearly 
‘biealar leat lobes. 
‘ rupra R. Br. eit Sse — Fronds deltoid, tec in. long, 
copiously bipinnate. Leaves of firm texture, red-bro broa 
ovate, always very obtuse. acs ospore like that of A. * ilicitssdlel 
Massulz covered with copious opiate eosuidies processes. = 
Hab. Australia and New Zealand. e 
| aRoLintaNA Willd. Sp. Plant. v. 541; Kuhn in Fl. Bras. 
= 659, tab. 82, figs. 1-6. — A. microph olla Kaulf. : Mart. Ic. Crypt. 
4-75. ao densa Desy -— A. mexicana Schlec eas por eer oe 
Spre eng. — dA. bonariensis — Fronds not more than 3 
long, more “Geltoid and ous copiously bipinnate than in 4 fli ee 
culoides, the brane ss racemose. Leaves of softer texture, 
nerall boid- 
cuticle finely granulated. Massule of the € microspores with copious 
septate rigid processes, with a glochidiate ti ae 
Hab. Southern U nevi States and California, through Tropical 
America to Buenos Ayr a 
4, A. prnnata R. Be Flind. Voy. ii. 611, t. 10.— Root-fibres 
fascicled and conspicuously feathered. Fronds oblong or deltoid, 
