128 



PERNS : BRITISH AND POREIGN. 



1-2^ feet long, smooth, contracted and fertile above, sterile 

 below; Sterile pinnules oblong, elliptical, oblique sub-cordate, 

 serrulate, 1-1 J inches in length. Veins forked ; venules free. 

 Fertile pinnules linear, 2-3 inches long, revolute, margin con- 

 niving and forming an universal indusium. Sporangia occu- 

 pying nearly the whole length of the contracted venules, 

 forming linear forked confluent son. 



1. L. cordifolia, Lag. ; Hook. Sot. Hag. t. 5159. Cerato- 

 dactylis osmundioides, /. Sm. in Hook, et Bauer, Gen. 

 Fil. t. 36 ; Lowe's New Ferns, t. 30. Botryogramma 

 Karwinskii, Fee, Gen. Fil. t. 15 C. Allosorus Kar- 

 winskii, Kunze, Fil t. 4 ; Hook. Ic. PL t. 387-8. 

 Mexico. Tr. 



** Veins anastomosing. 



3. Hcmionitece. Fronds simple, pinnate or rarely lipinnate. 

 Sort more or less complete reticulated. 



53. DICTYOGBAMMA, Fee. 



Vernation nniserial, contiguous; sar- 

 mentum short. Fronds pinnate or bipinnate, 

 1-3 feet high, smooth; pinnas elliptical- 

 lanceolate, 6-10 inches long. Venation sub- 

 uniform, reticulated; areoles unequal, gene- 

 rally elongated, oblique. Receptacles super- 

 ficial. Sori linear, reticulated, naked. 



1. D. Japonica, Fee, Gen. Fil. .15 A. 

 Hemionitis Japonica, Tliunb. Gym- 

 nogramma Japonica, Hook. Sp. Fil. 

 Japan, Formosa. 



Genus 53. Portion of 

 fertile frond. No. 1. 



54. HEMIONITIS, Linn. 



Vernation fasciculate, erect, short. Fronds simple, cordate, 

 palmate orpinnate, smooth or villose. Veins uniform reticulated. 



