310 CHARACTERS OF TRIBES AUD GENERA. 



exterior venules free ; the costal anastomoses transverse, 

 elongated, and sporang-iferous. Sori oblong, contiguous, 

 forming a sub-costal medial row. Sporangia immersed. 

 Iiidusium vaulted. 



Type. BJechnum radicuns, Linn. 



Illust. Hook, and Bauer Gen. Fil., t. 17 ; Moore Ind. 

 Fil., p. 33 B., fig. 1 ; J. Sm. Ferns, Brit, and For., 

 fig. 104 ; Hook. Syn. Fil., t. 4, fig. 36 a. 



Obs. — This is a well marked genus which in the " Species 

 Filicum " is represented by six species, three of which I, 

 however, exclude from true Woodwardia, as I consider them 

 sufficiently distinct to warrant their adoption under the 

 two following genera. 



The species here restricted to Woodwardia are remark- 

 able for producing numerous viviparous buds, which readily 

 become plants. 



Sp. W. radicans, Sm. (v v.) ; W. orientalis, Sw. (v v.) ; 

 W. Japonica, Sw. (v v.) . 



The two latter species are natives of China and Japan ; 

 the first is found in the South of Europe, Madeira, Azores, 

 Java, Mexico, California, Guatemala, and Northern India. 



176.— LoRKSERU, Presl (1849). 

 Woodwardia, HooTc. Sp. Fil. 



Vernaiion uniserial, sarmentum hypogeous. Fronds 

 distant, sinuose-pinnatifid or sub-pinnate, 1 to 1^ feet high, 

 the fertile contracted. Veins of the sterile frond uniform 

 reticulated ; fertile segments rachiform, costal anastomoses 

 transverse-elongated, sporangiferous. Sori oblong-linear, 

 contiguous, forming a costal row. Indusium vaulted. 



Type, Acrostichum areolatum, Linn. 



