672 1TLICES. 



139. A. lraeatum, Kaulf. Leaf linear, tapering into the subsessile base, costate ; 

 sori 2-4 on each side of the midrib, parallel to it, approximate, but distinct, sunk into 

 grooves the grooves lined by plaits, continuous throughout the fertile part of the leaf. 

 Schk. Crypt, t. 101. b. dextr. Hook. Gen. t. 107. — Polytamium, Desv. Vittaria lanceo- 

 lata, Sw. — Ambiguous between Antrophyum and Vittaria, of which latter genus it has the 

 narrow, rectangular vein-meshes. Leaves csespitose, l'-4" long, 3"'-2'" broad, acuminate, 

 or blunt, chartaceous. — Hab. Jamaica !, Pd.,"on trees, S. Georges , [Cuba ! and Guatemala I 

 to Brazil !]. 



140. A. lanceolatum, Kaulf. Leaf narrowly linear-lanceolate, tapering at both 

 ends, costate ; tori superficial, chiefly along the longer sides of narrow vein-meshes, often 

 anastomosing, in 4-2 flexuose series along the longitudinal diameter of the leaf. — Plum. Til. 

 t. 127. C. : a rough figure, and leaf too "broad. Schk* Crypt, t. 6. sin. — Hemionitis, Z.— 

 Leaf l£'-6" long, 6"'-4'"(-2'") broad.— Hab. Jamaica!, Pd., on fallen trees ; Dominica!, 

 S. Vincent !, Guild., Barbadoes ! ; [Cuba ! and Mexico ! to Venezuela! and Guiana !] 



22. CERATOPTERIS, Brongn. 



Sori continuous, decurrent aloug 1-2, special, longitudinal veins, parallel to the midrib, 

 embraced by the revolute, membranaceous margin of the narrow segments of the fertile leaf : 

 no proper indusium. Sporangia subsessile : ring often reduced : spores globose, large, few. 

 — An aquatic Fern ; fertile leaf 3-4-pinnatisect, sterile difform, membranaceous 2(-3)-j>w- 

 natipartite (^undivided), with broad, lobed segments : veins areolate. 



141. C. thalictroides, Brongn.— Hook. Gen. t. 12. Hook. Grev. le. t. 97-— Acro- 

 stichum, Z. Parkeria pteridoides and Lockhartii, Hook. Grev. — Hab. Jamaica !, Wils., 

 Wiles; S.Vincent!, Wright.; Trinidad !, Pd. ; [all tropical countries]. 



23. PLETJROGRAMME, Pr. 



(Cochlidium and Hymenolepis, Kaulf.) 



Sori continuous, lining closely the midrib, confluent transversely above it, confined to a 

 special anastomosis of veinlets in the upper part of the narrow leaf, often embraced by its 

 margin, naked. — Leaf linear, or forked. 



142. P. graminoides; Fee. Leaf linear, (or 2-fid at the summit), blunt, tapering 

 toward the subsessile base : fertile part laterally incurved round the included narrow soriis, 

 with a replicate, flattish margin : veins inconspicuous. — Sw. Synops. 1. /. 5. Hook. Gen. 

 t. 84. — Asplenium, Sw. Grammitis, Sw. Cochlidium, Kaulf. Monogramma, Desv.— 

 Leaf l"-2" long, 1'" broad, recurved.— Hab. Jamaica (Sw.), on trees, in the highest moun- 

 tains ; [Cuba ! to Venezuela ! and Guiana!]. 



143. P. linearis, Pr. Leaf linear, blunt, tapering at the subsessile base and upwards 

 into the base of the long, fertile part : the latter obtusely keeled above, biconvex beneath, 

 with the margin distant from the sorus : veins free with a thickish summit, not excurrent 

 iuto the margin ; sorus as broad as each of the convex sides, which line it. — Hook. Gen. t. 

 72. A., 75. A.— Ttenitis, Kaulf— Leaf 6"-4" long, 2'" broad below, 1*"' at the sorus, 

 flexuose. — Hab. Dominica !, S. Vincent! ; Trinidad !, Cr.; [Guadeloupe !]. 



24. BLECHNUM, L. 



Sori continuous (or interrupted), deenrrent along a special, longitudinal anastomosis ot 

 veins, parallel and usually approximate to the midrib : indusium lining the sorus at its exte- 

 rior side. — Veins beyond the sorus usually free. 



* Leaf-pinnatipartite- pinnate. 



144. B. polypodioides, Ttadd. Leaf 'pinnatipartite, pinnatisect at the base, pinnatifid 

 below the entire apex, shortly petioled : segments broadly adnate, oblong, pointed, suben- 

 tire, lowest short, deltoid : sinus acute : veins subdistant, most forked ; sori about half as 

 long as the segment, appressed to the midrib. — Variable in size ; sori unequal, superior often 

 wanting. — Hab. Jamaica {Pd.) ; [Haiti and Mexico to Peru! and Brazil]. 



