in 



L 



CVm. POLYPODIACE^. 579 



■ 



112. Maksti.eace.e. Capsules witliout a ring within involucres that 



are situated near the root of the plant. Tab. xii. f. 2, 3. 



113. Equisetace^. Fructifications terminal in spikes or catkins, con- 



sisting of peltate polygonous scales, on the under-side of whch 

 are from 4—7 involucres, which open longitudinally, and contain 

 numerous globose bodies enfolded by 4 filaments, clavate at their 

 extremities. Tab. xii. f. 4. 



OsD. CVIII. POLYPODIACE^ R, Br. (Tab IX f. 1-4 



X. and XL f. 1.) ' ' '' 



CapsulesdoTsal or marginal, surrounded by a rino-, reticulated 

 and pellucid, opening transversely and irregularly. Fronds 

 circinate in sestivation. 



A. Capsules opening transversely, placed on the hack of the frond, hut some- 

 times close to its margin ; their ring vertical^ usually 'incomplete, 



* Sari neither furnished with an involucre nor covered hy the reflexed 



margin of the frond. 



1. Ceterach. Sori linear, on reticulated veins, covered with chaffv 

 r scales. Tab. ix. f. 1. •^ 



2. Gymnogramme. Sori linear, on forked veins, naked. 



3. PoLYPODiuM. Sori roundish. Veins simple or forked ("in British 



species). Tab. ix. f. 2. 



bori with an involucre, or covered hy the reflexed margin of the frond. 

 t Sori roundisk,_ Involucres placed upon the bach of the lateral veins. 



4. WooDSiA. Sori roundish. Involucre below the sori, more or less 



cut at the margin. Veins forked. Tab. ix. f. 3. 



0. AspiDiuM. Sori roundish. Involucre above the sori, orbicular 



(Polystichum) or reniform {Lastrea). (Veins forked in British 

 species). Tab. ix. f. 4. 



6. Cystopteris, Sori roundish. Involucre acuminate, cucidlate at 



the base, attached below. Sorus on one side. Tab. x. f. 1, 



It Sori oblong or linear. Involucres attached by the one side to the lateral 



veins, openijig at the other. 



7. AsPLENiuk. Sori elongated (Asplenimn) or oblong-reniform {Athy- 



rium), arising from lateral veins, opening towards the midrib 

 (Veins forked in British species). Tab. x. f. 2. 

 o. bcoLOPENDRiuM. Sori elongated, straight. Involucre double, the 



two portions opening towards each other. Tab. x. f. 3. 



ttt Sori marginal or parallel to the midrib, covered either by an involucre 



or by the reflexed margin of the frond. 



9. PxERis. Sori continuous, at the margin of the frond. Involucre 

 1A n ^*^^^^s^^^^g of the reflexed margins. Tab. x. f. 4. 

 lU. Lryptogramma. Sori roundish at the margin of the frond, at 



length confluent and covered by the recurved margins meeting iu 



the middle. Tab. x, f. 5 



CG 2 



