186 34. BLECHNUM, § EUBLECHNUM. 



a point, the lower side truncate and slightly auricled, the upper side cordate with 

 a large hastate auricle, the lower ones broader and shorter ; teactwre coriaceous ; 

 rwMs and both surfaces naked or slightly pubescent ; wins fine, the lateral ones 

 often twice forked ; fertile pinnm narrower ; sori midway between the midrib 

 and edge, in a continuous or interrupted line. — Hk. Sp. 3. p. 57. 



Hab. Temperate S. America. — M. remotum, PresI, ia a small pubescent form, and 

 Tcenitis sagittifera, Bory, a form with pinnatifid pinnsB. Very near B, australe, but the 

 sori more interrupted and not so near the midrib. 



12. B. australe, Linn. ; caud. stout, creeping, scaly ; st, erect, 4-6 in. 1. ; fr. 

 9-18 in. 1., 2-3 in. br., lanceolate, narrowed towards both ends ;pinn(e numerous, 

 spreading, the sterile ones 1^ in. 1., ^-| in. br., linear, narrowed to a sharp 

 point, hastate-cordate or auricled at the base, especially on the upper side, quite 

 distinct, the lower ones passing down into mere auricles ; texture rigid and 

 coriaceous ; veins hidden ; rachis and both surfaces naked ; fertile pinnce 

 narrower ; sori in a continuous or slightly interrupted line not quite contiguous 

 to the midrib, sometimes reaching the edge. — Hk. Sp, S. p. 67. 



Hab. S. Africa, northward to Bourbon, Madagascar, and Natal. — This and the pre- 

 ceding may be known from all the others by having a space between the sori and 

 midrib, which characterizes Fresl's genus Mesothema. 



13. B. Iceviffotum, Cav. ; caud. stout, ascending, clothed at the crown with 

 large lanceolate pale-brown scales ; st. erect, 6-9 in. 1., pale, naked or scaly 

 below ; barren fr. oblong-deltoid, 9-16 in. 1., 6-9 in. br., with a large lanceolate 

 terminal pinna, and numerous spreading oblong-lanceolate lateral ones on each 

 side, the largest of which are 3-4 in. 1., 1 in. br., narrowed suddenly to an 

 acuminate point, the margin slightly serrated, quite distinct and cordate at the 

 base ; -textwe coriaceous ; rachis and both surfaces naked, or the former slightly 

 scaly ; mns inconspicuous and nearly 1 lin. apart ; fertile fr. smaller and the 

 pinnae narrower and more distant, the line of sori contiguous to the midrib, 

 3^-2 lin. br., with a large brown membranous invol. — Hk. Sp, 3. p. 56. 



Hab. N. S. Wales. 



14. B. serrulatwn, Rich. ; caud. elongated, stout, ascending ; «*.6-12 in.l., strong, 

 erect, smooth, nearly naked ; fr. oblong-acuminate, 1-2 ft. 1., 6-9 in. br., witli 

 12-24 pairs of quite distinct articulated linear-oblong pinnce on each side, the 

 largest of which are 4-6 in. 1., -^-j in. br., narrowed gradually towards the point 

 and downwards to a narrow base, the margin finely incised ; texture coriaceous ; 

 rachis rigid, naked ; veins very fine and close, not conspicuous ; fertile pinnce 

 narrower; sori in a continuous line close to the midrib. — Hk. Sp. 3. p. 64. 

 B. striatum, Br. Hk Sp. 3. p. 65. t. 169. 



Hab. Florida, W. Indies, Guiana, and Brazil; Australia, New Caledonia, Borneo, 

 Malacca, and Mishmee. 



16. B. orientale, Linn. ; caud. stout, erect, clothed at the crown with fibrillose 

 dark-brown scales ; st. 4-8 in. 1., strong, erect, scaly below ; Jr. 1-3 ft. 1., 6-12 in. 

 br., ovate, with very numerous nearly contiguous linear pinnce on each side, 

 which are 4-8 in. 1., f- j in. br., narrowed to a long point, the bases quite distinct, 

 the upper ones decurrent, a few of the Iqwest mere auricles ; texture sub- 

 coriaceous ; rachis and both surfaces naked ; veins fine and close ; sori in a long 

 eontinuous line close to the midrib. — Hk. Sp. 3. p. 62. F. Ex. t. 77. 



Hab. Australia and Polynesian Islands northward to S. China and the Himalayas. — 

 Presl places this with species 4, 6, 6, 14, and 17, in his genus Blechnopsis, characterized 

 bj having a cartilaginous border to the pinnae which unites the tips of the veins. 



16. B. melanopm, Hk. ; st, erect, 6 in. I., naked, dark chesnut-brown ; fr. 



