(36) * A NEW JAPANESE POLYPODIUM. 



mm. long and 0.3 mm. broad. The vertical section of the rhizome shows a 

 sheath of brownish-red sclerenchyma, and, inside ^of Jt, bundles of scalari- 

 form cells, which anastomose here and there. The transverse section of the 

 rhizome, as figured in the plate, shows three groups of scalariform cells, and 

 outside each of them a group of sclerenchymatous cells. The continuation of 

 the scalariform cells and sclerenchyma into the stipe and root is well seen 

 in the vertical and transverse sections of the rhizome. The young and un- 

 developed fronds at the apex of the rhizome are invested with minute segmented 

 hairs. The roots are branched and about 0.2 mm. in diameter*; their transverse 

 section shows, within a layer of parenchyma two cells thick, a ring of scleren- 

 chyma consisting of one or two layers of cells, interrupted here and there; 

 and in the center is seen a delicate vascular bundle. The epidermal cells of the 

 root are flattened, depressed at the middle, and elevated at the edges. The 

 hairs of the root are unicellular, simple or branched, longitudinally striated, 

 and brown in color. The short stipe is nearly terete and about 0.3 mm. in 

 diameter at the base, but is winged above, the wings passing into the lowest 

 lobes. Its transverse section at the base is similar to that of the root, except 

 that the ring of sclerenchyma is more massively developed and the epidermal 

 cells are not flattened. The veins which proceed from the costa and enter Into 

 tlie lobes of the frond are somewhat geniculate and thickened at the angle, 

 and the sorus is borne on the thickened point. The hairs on the frond are 

 stiff, spreading, and brown in color, consisting of obliquely jointed and thick- 

 walled cells; the larger hairs consist of about 6 cells, and are more than i mm. 

 long. On the upper surface of very old fronds hairs are not found. Besides 

 these hairs, there are, on the under surface of the lobe, minute delicate hairs 

 consisting of two or three joints. Stomata are found on the under surface of • 



