200 



short lobes have sometimes a double series. In many cases it is con- 

 fined to tbe upper half of tbe frond. The upper surface is usually pitted 

 with elliptical depressions over the sori. a is found in the region of the 

 Govt. Cinchona Plantations. 



Tribe XI. Grammitide^;. 



Sori arcuate, oblong, linear-oblong, or linear, short or more or less 

 elongated and continuous, situated on the veins, which form the 

 receptacles, and disposed variously in simple, forked or confluent and 

 reticulated lines, superficial or immersed ; quite destitute of involucres ; 

 sporangia stalked, compressed, arched by an incomplete vertical jointed 

 band, splitting transversely at maturity ; fronds from less than an inch 

 to several feet long, entire or variously cut and often multifid ; venation 

 simple or forked and free, united or copiously reticulated. 



The plants of this tribe form a moderately limited group representing' 

 one fairly extensive genus and five very small ones, which are loosely 

 connected by the single tribal character of naked elongated sori. The 

 large majority inhabit regions within the tropics of both Hemispheres, 

 only a few extending beyond, chiefly in the south temperate zone. 



Sori transversely oblong or arcuate ; fronds pin- 

 nate ; primary veins costate, the transverse arcuate.— 1. Heniscium. 



Sori oblong, linear-oblong or linear ; fronds 

 simple or compound ; veins free. - 2. Gymnogramme 



Sori linear- oblong, immersed in the parenchyma; 

 fronds simple ; veins united. — 3. Enterosora. 



Sori reticulated ; fronds palmate or pinnate. — 4. Hemionites. 



Sori sparingly diffused over the under surface ; 

 fronds simple ; veins reticulated. — 5. Anetium. 



Sori reticulated or zigzag in oblong angular 

 meshes ; fronds simple ; veins areolate. — 6. Antrophyum. 



Genus XXVI. Meiscium, Schreb. 



Sori oblong, curved, dorsal on the arc of the united transverse vein- 

 lets ; primary veins costate, raised, pinnatiform, connected by opposite 

 united curved or angled branches, which form multiserial narrow 

 transverse areolae containing each a free or attached erect veinule ; 

 fronds rarely simple, chiefly pinnate. 



All the species of this genus within the geographical scope of this 

 Flora are pinnate. The sori, though strictly confined to the transverse 

 veins, become ultimately confluent partly or quite concealing the under 

 surface of the fronds. The outer fronds are generally barren and the 

 inner fertile ; and the united veinlets in the former are angled while 

 in the latter they are arcuate. Generally the species are well defined, 

 and they vary only in size and form. They are terrestrial plants pre- 

 ferring moist or wet situations. About a score of species altogether, 

 are known. 



Fronds dimorphous, the pinnae of the fertile re- 

 duced, and the sori covering nearly the whole 

 surface. — 1. M. angustifolium. 



Fertile fronds not much modified in size of 

 pinnse, and sori not generally confluent. — 2. M. serratum. 



3. M. reticulatum. 



