MENISCIUM. 165 



costa rather slcMider pron\inent beneath, veins indistinct above 

 slightly prominent and manifest beneath, each pair sends 

 out opposite branches whicii unite and form a costal areola 

 this united pair is prolonged to the margin and sometimes 

 a second areole is formed and thus there is a solitary or there 

 are two transverse veins which are soriferous, sori linear 

 parallel with the costa rarely interrupted and probably formed 

 by the union of two oblong confluent ones. 



Hal). Sierra (le Crystal, tropical W. Africa, G. Mann, n. 1672.— This is quite a 

 new, and in many respects a very peculiar species, yet 1 think it can hardly be 

 separated from the genus Menisciuin. The transverse sori form one or two 

 series between the costa and the margin and parallel with them. 



7. M. serratum, Cav. ; caudex ascending, stipites from the 

 thickness of a duck's to that of a swan's quill 1-3^ feet long 

 brown glabrous, fronds 1^-3| feet long coriaceo-chartaceous 

 dark-brown green when dry pinnated, pinnae 5 inches to 1 

 foot long i an inch to 2 inches wide from a generally broad 

 and obliquely cuneated mostly sessile base oblong gradually 

 acuminated, the margin strongly and sharply serrated, sori- 

 ferous veins numerous but varying in proportion to the 

 breadth of the pinna forming an acute angle or a slightly 

 curved line the produced veinlet short and interrupted or 

 continuous through to the margin, sori short and rounded or 

 elongated and composed of two confluent ones very copious 

 and of a bright snuff" colour.— "Car. Prcelect. 1803. p. 548?" 

 Sw. Syn. FIL p. 19. M. palustre, Ruddi, Fil. Bras. p. d. t. 20 

 {very accurate). Metten. Fil. Hort. Lips. p. 84. M. dentatum, 

 •' Pr. Delic. Prag. \. p. 162. n. 6." 



Ilab. Tropical America, Brazil, Gardner, n. 15, 1905 (M. rostratum, Fee, Gen. 

 Fil. p. 224, t. 18, /. 3), Spruce, n. 36*. Guiana, Schomburgk, n. 459, Richard 

 Schombur(jk,n. 1674, Appun, n. 171, Sagot, n. 720. N. Granada, Hollon, n. 30. 

 Panama, Satton Hayes, u. 32. Mexico, Jurgensen, n. 917 (\1. Jiirgensenii, Fee, 

 Gen. Fil. p. 225).— Raddi's figure and description are perhaps the best authority 

 for this species, if indeed it be a species, of which I am very doubtful. 1 possess 

 not a few specimens on which I cam\ot decide whether they should be referred 

 to this or to M. reticulalum. 



8. M. reticulatum, Sw. ; caudex stout erect or ascending, 

 stipites 1-3 feet long, fronds U-4 feet long [Spruce) rarely 

 subpubescent coriaceo-membranaceous pinnated, pinnae 

 5-6-12 inches long and from J of an inch to 3-4 inches 

 wide ; fertile ones sometimes contracted oblongo-lanceolate 

 acuminated the base obliquely obtuse or cuneately attenuated 

 lowest ones often petiolate, the margin generally entire or 



