LYCOPODIACEAE 61 



Occasional in open dry grasslands, dry thickets, etc, Diliman, San 

 Francisco del Monte, etc.; widely distributed in the Philippines. Japan 

 and Korea to India, southward to Australia. 



2. L. flexuosum (L.) Sw. Nito (Tag.,, Vis.). 



A twining somewhat pubescent fern reaching a length of several meters, 

 the dwarfed branches short or none, the stems somewhat ridged. Sterile 

 pinnae pinnate, mostly J5 to 20 cm long, the rachis usually narrowly winged, 

 the upper pinnules sessile, subconfluent, the intermediate ones hastate and 

 usually more or less cordate, the lowest ones usually pinnate, the segments 

 oblong to lanceolate, obtuse to acuminate, 4 to 10 cm long, mostly 10 to 18 

 mm wide, very finely serrate. Fertile fronds about the same size as the 

 sterile ones, not more compound, the segments about as large as the sterile 

 ones. 



Occasional in thickets, Masambong, San Francisco del Monte, Diliman, 

 etc.; widely distributed in the Philippines. India to southern China south- 

 ward to Australia. 



4. MARSILEACEAE (Marsilea Family) 



Slender plants growing- in mud or in shallow water, the rootstocks 

 creeping, the leaves long-petioled, 4-folialate, circinate in vernation, the 

 leaflets sessile, obovate-cuneate, the nerves radiate-parallel. Sporangia 

 borne in closed, short-stalked sori or sporpcarps close to the rootstocks, on 

 very reduced and modified leaves. Spores of two kinds, borne in the 

 same sporocarp, macrosporangia each containing one macrospore, and mic- 

 rosporangia, each containing numerous microspores. 



Genera 3, species 75, warmer parts of both hemispheres, a single genus 

 and 1 or 2 species in the Philippines. Entirely different from all other 

 ferns in habit. 



1. MARSILEA Linnaeus 



Characters of the Family as given above. (In honor of G. Marsigli, an 

 early Italian botanist.) 



Species 56, in most warm countries, 1 or 2 in the Philippines. 



1. M. crenata Presl. 



Rootstock slender, creeping, branched,, the stipes of the sterile fronds 2 

 to 12 cm high, slender; leaflets 4, obovate-cuneate, glabrous, 10 to 15 cm 

 long, or smaller in terrestrial forms, rounded and slightly crenate or 

 subentire at the apex, the lateral margins entire, straight, cuneately nar- 

 rowed to the sessile base. Sl)orocarps covered with brown hairs when 

 young, becoming glabrous or nearly so, oblong, about 3 mm long, rounded, 

 slightly compressed, somewhat clustered or solitary, their pedicels 5 mm 

 long or less, the upper basal tooth prominent. 



In muddy places, shallow pools, etc., Calooean and Santa Ana; widely 

 distributed in the Philippines. Endemic. 



5. LYCOPODIACEAE (Clubmoss Family) 



Perennial, erect, prostrate, or pendulous, simple or branched plants with 

 fibrous roots, the stems usually produced. Leaves small, simple, 1-nerved, 

 entire or toothed, continuous with the stem, mostly very numerous and 

 densely arranged in many rows, rarely distichous. Sporangia in the axils 

 of the leaves or crowded in terminal, often elongated spikes at the ends 



