FERNS OF THE MALAY-ASIATIC REGION. 63 



fertile pinnae lobed almost to the costa ; lobes about four on a side/ each 

 almost entirely occupied by a large sorus. 



Java, Celebes, Mindanao, Negros, Mindoro, at middle elevations (1,000 to 2,000 

 m). 



4. CIBOTIUM Kaulfuss. 



Caudex stout and erect, sometimes arborescent, the apex densely 

 imbedded in brown or golden chaff; fronds large, tripinnatifid or tripin- 

 nate; sori marginal on the lower part of the segments, at the apices of 

 veins, the fertile tooth like the indusium, brown and coriaceous, the two 

 inclosing the young sorus; annulus complete, but with a stomium of 

 distinct cells. About 12 recognized species, in and near Central America, 

 in the Hawaiian Islands, and here. I follow Dr. Christ in the treatment 

 of our species. 



Sori 2 or more on each side of the segments. 

 Pinnules 2 cm or more wide. 



Sori 2 to 4 on a side, not prominent 1. G. baranetz 



Sori 5 or 6 on a side, prominent 2. C. assamicum 



Pinnules 8 mm wide 3. C '. sumatranum 



Sori 1 on each side of the segments 4. C. cumingii 



1. Cibotium baranetz (L.) J. Sm. 



Larger pinnules 2 cm wide; stalked, narrowly lanceolate, long-acu- 

 minate at the base cut very nearly or quite to the costa, costa more or 

 less hairy; segments lanceolate, falcate, acute, about 1 cm long, subentire 

 or somewhat serrate, decidedly glaucous beneath, separated by narrow 

 sinuses; veinlets mostly simple; sori usually 2, sometimes 3 or 4 on each 

 side, not prominent, 1 mm wide, the lowest oblique, the others parallel 

 to the segment, the outer valve of the indusium the larger and more 

 convex. The caudex is erect and stout but usually not arborescent. 



Liu Kiu across China to Malacca and northeastern India; Java ( ?). 



2. Cibotium assamicum Hook. 



Pinnules up to 25 mm wide; larger segments 15 mm long, evidently 

 serrate; sori prominent, borne on teeth, up to 6 on a side; valves more 

 unequal, and texture of whole plant rather thinner than in C. Baranetz, 

 which it resembles except as just noted. A plant in cultivation at Buiten- 

 zorg agrees perfectly with this species as described, except in not being 

 glaucous beneath. 



Assam, Tonkin. 



3. Cibotium sumatranum Christ in Philip. Journ. Sci. Bot. 2 (1907) 118. 

 Fertile pinnules only 8 mm wide, cut to a wing 1 mm wide; segments 



3 mm long, obtuse, denticulate, separated by obtuse sinuses; sori 2 or 

 rarely 3 on a side, 0.5 to 0.7 mm wide, not prominent, valves subequal; 

 plant glabrous or nearly so. 



