UNDERWOOD: FERNS OF THE PHILIPPINES 669 
2. Homosporous (spores uniform) ; all terrestrial or epiphytic except Ceratopteris. 3. 
Heterosporous (producing minute microspores and larger macrospores) ; aquatic, 
rooted or floating ; sporangia borne in ovoid or spherical conceptacles ( sporocarps). 
IV. Salviniales. 
3- Sporangia on the under surface of the leaf, borne in boat-shaped or circular concep- 
tacles (symangia) ; eusporangiate ; vernation circinate. Il. Marattiales. 
Sporangia borne in sori directly on the veins or exceptionally in spikes or panicles. 4. 
4. Vernation erect or inclined ; eusporangiate, the sporangia ringless, leathery, open- 
ing by a transverse slit, arranged in spikes or panicles. I. Ophioglossales. 
Vernation circinate ; leptosporangiate, the sporangia membranous, usually provided 
with a ring which opens elastically. III. Filicales. 
I. OPHIOGLOSSALES 
The fleshy plants of this order making up the single family 
Ophioglossaceae are arranged in four genera. 
I. Terrestrial plants. 2. 
Epiphytic, pendent from trees ; leaf strap-like, bearing a spike near the middle. 
OPHIODERMA. 
2. Sporangia in two-ranked spikes; leaves simple; veins anastomosing. 
OPHIOGLOSSUM. 
Sporangia in panicles ; leaves compound; veins free, 3. 
- Panicles lax, the sporangia 2-ranked. BoTRYCHIUM. 
Panicles close, spike-like ; the sporangia clustered and crested. 
HELMINTHOSTACHYS. 
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The members of this family are mostly small plants and the 
species of Ophioglossum especially would be likely to be over- 
looked. Four species of Ophioglossum are already known and the 
other genera are each represented in the islands by a single spe- 
cies. Ophioderma has leaves a yard or more long; it is often 
united to Ophiog/ossum, but in both habit and structure it is abun- 
dantly distinct. 
Il. MARATTIALES 
The members of the tropical family Marattiaceae are’ mostly 
large fleshy plants with stout stems rising from ponderous corm- 
like trunks. There are three genera known from the Philippines : 
1. Leaves ternate or palmate ; synangia circular, depressed in the center. KAULFUSSIA. 
Leaves pinnately compound; synangia oval or boat-shaped. 2. 
2. Capsules concrete in boat-shaped synangia. MARATTIA, 
ANGIOPTERIS, 
Capsules close but not concrete, collected in oval sori. 
Kaulfussia is represented by a single small species with leaves 
resembling those of the horse-chestnut. MJaraitia has two with 
