74 AMERICAN FERN JOURNAL 
spatulate leaves, with thinner, usually broader blades, on 
the upper sides of which the veins show; the petioles are 
much more slender, and the paraphyses are of a different 
shape. 
A. Williamsi resembles A. parvulum Blume even more 
than A. nanum, but this species also has thinner leaves, of 
somewhat different shape; the veins are not evident on 
the leaf surface, and the petioles are proportionately much 
shorter; the paraphyses also are different. A. parvulum 
~as a rule reaches a larger size than A. Williamsi. 2 
Luzon and the other large Philippine Islands are, like 
Cuba, very incompletely known botanically. The north- 
ern, western, and southern portions have been the most 
explored and are fairly well known, but much of the- 
interior and eastern part has always been difficult of 
access, both because of its very rugged mountainous 
topography, and because of the hostile character of the 
_ natives. Eventually it it should aie a eis nutnber of 
: a new plants. 
EXPLANATION: OF PLATE 4 
iL Geena peer; natural ae 
eae One of the seen, natural size. 
3 A single leaf from the plant shown it fi 2, x 2. 
— : 
a aily oe ‘sitechment of the ‘porania and the paraphyses, 7 
Cross section of the petiole of the same leat with its double 
“68 Type fora of paraphyses, gently magni 
: York Borasteat Garpen. 7 
