\ 
294 CONCERNING NOMENCLATURE, 
OPHIOGLOSSAC&. 
Sporangia without aring formed 
of the interior tissues of the leaf, 
borne in spikes or panicles and 
discharging their spores through a 
transverse slit ; fronds erect or in- 
clined in vernation; roots usually 
fleshy ; prothallia subterranean. 
Ophiegsace> = GENERA—OPpAdoglossum, Botrychium. 
OSMUNDACE€. 
Sporangia spherical on altered portions 
of the fronds, opening longitudinally ; 
ring rudimentary; rootstock very large; 
fronds in circular crowns. 
GENUS—Osmunda, Osmundaceas 
SCHIZAACEA, 
Sporangia egg-shaped, borne usually on a 
contracted portion of the frond, opening long- 
Sas view itudinally; ring apical; rootstock short 
Schizwoces Or creeping; rachis often twining. 
GENERA—Schizea, Lygodium, 
HYMENOPHYLLACE&. 
Sporangia sessile along a bristle like 
receptacle and surrounded by an urn- QP 
shaped or funnel-form, two-lipped in- “"" 
volucre; ring transverse, opening verti- "omeryes 
cally ; rootstock creeping; fronds very delicate often but 
one cell thick. 
GENUS— Trichomanes. 
