ASPIDIE^E MEN1SCIUM. 33 



pinnules, herbaceous, slightly pubescent on the veins beneath; areolae 5 to 

 9 between costa and margin. The simple form is M. simplex Hooker. 



Isabela-Luzon, Warburg 11609; Leyte, Cuming 299; Negros, Cope- 

 land 76. 



India to Java and Formosa. 



(2) M. cuspidatum Blume. Stipe 30 to 100 cm. high, brownish, 

 naked; frond 40 to 100 cm. high, with few scattered pinn*, the terminal 

 like the lateral; pinnse erecto-patent, about 15 cm. long by 3 cm. broad, 

 caudate-acuminate, usually falcate at the end, nearly entire, short stalked 

 or sessile, subcoriaceous, glabrous or nearly so, dark green above, with rows 

 of light or reddish dots marking the excurrent veinlets. This species 

 is very near Nephrodium urophyllum, but must be specifically distinct 

 even if -the genera were united. 



Luzon, Cuming 178; Mount Mariveles, Whitford 272; Leyte, Cuming 

 314; Mindoro, Cuming 361. 



Himalayas, Java. 



(6) ASPIDIUM Swartz. 



Fertile and sterile fronds alike or nearly so, inclined toward a triangular 

 shape, and the pinnae toward a stronger development of the basiscopic 

 side; texture moderately thin; veins anastomosing irregularly, usually 

 very copiously, with or without free included veinlets; sori nearly always 

 round, on a distinct receptacle; indusium peltate, reniform or wanting. 

 An almost exclusively tropical genus of terrestrial ferns, whose greatest 

 development is reached in this region; intimately related, through Pleocne- 

 mia, to Nephrodium. The most of our species seem to be of very local 

 occurrence, and not even locally abundant; the number of species still 

 to be discovered is therefore probably large. The arrangement of the 

 species adopted here is probably artificial, and it is therefore undesirable 

 to raise any of these groups (unless it be Pleoonemia) to generic rank. 



1. Veins anastomosing very copiously. 

 2. Indusium wanting, Arcypteris. 

 3. Fronds simple. 



4. Lowest lobes entire (1) A. Bryanti 



4. Lowest lobes forked or lobed (2) A. Barberi 



3. Fronds pinnate. 



4. Sori in rows along main veins. 



5. Pinnae mostly entire (2) A. Barberi 



5. Pinnae pinnatifld (3) A. macrodon 



4. Sori strictly marginal (4) A. Brogniartii 



4. Sori scattered. 



5. Pinnse entire or once forked (5) A. lamaoense 



5. Pinnae pinnately lobed. 



6. Veinlets inconspicuous (6) A. difforme 



6. Veinlets very conspicuous 



above (7) A. Whitfordi 



2. Indusium reniform, Sagenia. 



3. Sori in rows along main veins. 

 4. Frond not compound. 



5. Rhizome erect (8) A. heterodon 



5. Rhizome creeping (9) A. decurrens 



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