176 CHARACTERS OF TRIBES AND GENERA, 
Ilust. Schk., Fil., p. 82; Fée, Gen. Fil, p. 97, t. 9 B.; 
Moore's Ind. Fil, p. 13 A.; Hook, Syn. Fil, t. 6, 
fig. 51, a. b. 
Oss.— This genus represents the simplest state of vena- 
tion in Ferns, the fronds being so small and narrow that 
no lateral veins are produced, the whole vascular structure 
consisting of the mid.rib only. In the typical species of 
the genus, M. graminea, the sporangia are produced on the 
face of the mid.rib; but in an additional species of recent 
discovery, the sporangia are seated in grooves on each side 
of the mid.rib, and although this is a very special cha- 
racter, it nevertheless does not seem to me sufficient to 
warrant their separation as a distinct genus. 
Sp. M. graminea, Schk., Fil., p. 82, t. 9; M. trichoidea, 
J. Sm.; M. darewcarpa, Hook., Sp. Fil. 5, t. 287 A.; 
M. subfalcata, Hook., Sp. Fil. 5, t. 219 A.; M. rostrata, 
Hook., Sp. Fil. 5, t. 287 B. 
Oss.—These species are widely distributed, being found 
in South Africa, Mauritius, Borneo, Philippines, New 
Hebrides, also in the West Indies and Central America. 
In M. trichoidea the line of the sporangia is interrupted, 
forming several short sori, each included in a fold of the 
frond, similar to a sheath, which M. Fée has considered 
worthy of being characterised as a distinct genus which 
he has named Vaginularea, but which I do not adopt. 
84. Dicuipopreris, Brack. (1854). 
Monogramma sp. Hook, Sp. Fil. 
Vernation uniserial, sarmentum short. Fronds con- 
tiguous, cæspitose, linear, 6 to 12 inches long, narrow, 
graminoid, flaccid, with a central costa and sub-parallel vein ` 
on each side, which are sporangiferous nearly their whole 
