polypodiacejE. 257 



distant at the base) tapering into a narrow, tail-like, serrate point. 

 Pinnules or secondary divisions approximate and somewhat imbri- 

 cated; the ultimate ones less so; these are narroio-linear, short and 

 obtuse, their apices either simple or bifid. RhacMs round at the base, 

 narrowly-icinged upwards, and slightly scabrous on the under side. 

 Veins throughout very thick and prominent. Sori copious all over 

 the frond. Indusium cylindrical, with an attenuated base and a 

 spreading, entire mouth, seated on a short supra-axillary lacinia, or 

 else terminal, partially immersed, or with two icings, which are some- 

 times so narrow as scarcely to be perceptible. Receptacle exserted, 

 about twice the length of the indusium, and quite straight. 



This is closely related to the T. angustatum of Carmichael, as 

 figured in Hooker and Greville's Icones Filicum. 



Plate 36. — Fig. 5. Frond, of the natural size. 5 a. View of a 

 portion of the same, from beneath. 5 b. Sorus, with part of the indu- 

 sium removed. 5 c. Sporangia. — The details more or less magnified. 



* * * * Rhizoma ccespitosum. 



16. Trichomanes Smithii, Hook. 



Tnchomanes Smithii, Hook. Ic. PL 8 ; t. 704, & Spec. Fil. 1, p. 138. 



Hab. Mountains near Banos, Luzon, Philippine Islands : on trunks 

 of trees. 



A charming species, and very peculiar in its cellular structure. 

 The fronds are from 4 to 6 inches long, very slender, and delicately 

 " subpalmato-pinnatifid," with elongated, remote, spreading laciniae; 

 the ultimate ones the longest. Cells linear and transversely arranged 

 in longitudinal rows, traversed by oblique partitions, the marginal 

 row the smallest. Indusium urceolate, coriaceous, seated on a short 

 and supra-axillary lacinia, almost free, having only a narrow wing at 

 the base, which sometimes extends to the spreading mouth. Recep- 

 tacle very long, slender and curved, exserted at least four times the 

 length of the indusium. 



05 



