CHAPTER XXIX, 



JAMES ONI A, Hooker and GreviUe. 

 (Jame-so'-ni-a.) 



HIS genus, named after Dr. William Jameson, Professor "of 

 Botany at Quito, is monotypic — that is to say, it contains but 

 one species, wMch, however, has several varieties. It belongs 

 to the tribe Grammitidece, and in Hooker and Baker's 

 " Synopsis Filicum " forms Genus 49, though by Mettenius it 

 is placed in Gymnogramme, to which it is closely allied. The distinctive 

 character of the plants belonging to the genus resides in the sori (spore 

 masses), oblong in shape, being placed on the flabellate (fan-shaped) veins on 

 the back of the pinnaj (leaflets), remote from the edge. 



Culture. 



/. imhricata and its varieties all succeed well under greenhouse treatment. 

 A compost of an open nature, made of two parts fibrous peat, one part 

 chopped sphagnum, and one part silver sand, suits them best. They require 

 copious watering at the roots, but should not be syringed overhead. 

 Propagation is usually eifected by the division of their rhizomes, but they 

 may also be increased by means of the spores, which are abundantly 

 produced, and germinate freely when sown in a warm temperature. Not 

 being of a very decorative character, these plants, though thoroughly distinct, 

 are not extensively found in jDi'ivate collections ; their culture being generally 

 limited to botanic gardens. 



