276 
CHRIST. 
AZOLLA Lam. 
Azolla africana Desv. 
Mindanao, Lake Lanao, Camp Keithley, Mrs. Clemens s. n., March, 1907, with 
Lemna trisulca Linn. 
MARSILEA Linn. 
Marsilea Mearnsii sp. nov. 
Semiaqnatica aut terrestris, rhizomate longe et late repente ramoso, 
1 mm erasso, nudo brunneo, radicoso, foliis fasciculato-caespitosis, ixu- 
merosis, stipitibus 8 ad 10 cm longis tenuibus flaccidis midis nti foliola, 
sed ad basin coma tomentosa ochracea circumdatis, lamina quadrifaria, 
foliolis 1.5 cm longis et fere aeqnilatis, cnneato-trigonis, angulis obtusis, 
latere exteriore denticulatis, dentibns brevibns triang-ularibis 5 ad 8, 
lamina spurns nervis translncidis experte; sporotheciis numerosis glome- 
ratis, e rhizomate ad foliornm basin orinndis, stipitibus solitariis, stipite 
0.5 ad 1.5 cm longo, rigido, tereti, rafo-ochraceo, pilis ochraceis tomen- 
tello, sporotheciis ovato-rotundatis, borizontalibns, ad stipitem manifeste 
lateraliter adnatis, 3 mm longis, atro-branneis, tomento griseo sparsis; 
colore plantae laete virente, textnra herbacea. 
Luzon, Province of Ilocos Norte, Bur. Sci. 2317 Mearns, January, 1907. 
Belonging to the essentially African group with single adnate conceptacles. 
