276 CHRIST. 
AZOLLA Lam. 
Azolla africana Desv. 
Mindanao, Lake Lanao, Camp Keitliley, Mrs. Clemens s. n., March, 1907, with 
Lcmna irisulca Linn. 
MARSILEA Linn. 
Marsilea Mearnsii sp. nov. 
Semiaquatica aut terrestris, rhizomate longe et late repente ramoso, 
1 mm crasso^ nudo bninneo, radicoso, foliis fasciculato-caespitosis, nu- 
merosis, stipitibus 8 ad 10 cm longis tenuibus flaccidis nudis uti foliola, 
sed ad basin coma tomentosa ocliraeea circumdatis^ lamina quadrifaria, 
foliolis 1.5 cm longis et fere aequilatis, cnneato-trigonis, angulis obtusis, 
latere extoriore denticulatis, dentibus brevibus triangularibis 5 ad 8, 
lamina spuriis nervis translueidis experte; sporotheciis mimerosis glome- 
ratis, e rhizomate ad foliorum basin oriimdis, stipitibus solitariis, stipite 
0.5 ad 1.5 cm longo, rigido^ tereti, mfo-ochraceo, pilis ochraceis tomen- 
tello, sporotheciis ovato-rotundatis, horizon tali bus, ad stipitem manifeste 
lateraliter adnatis, 3 mm longis, atro-bnmneis, tomento griseo sparsis; 
colore plantae laete virente, textura herbacea. 
Luzon, Province of Ilocos Norte, Bur. Sci. 2S17 Mearns, January, 1907. 
Belonging to the essentially African group with single adnate conceptacles. 
