56 IJ LECH NUM. 



cate at tlie base su]>coriaceous or more or less membrana- 

 ceous and subdiaphanous closely subpellucido-punctate pin- 

 nate, pinna) 15-21 spreading sessile (not articulate) distant 

 dentato-serrate truncate at the base, terminal one the 

 largest obtuse, sterile pinna3 elliptical or oblongo-lanceo- 

 late and shortly and rather obtusely acuminate, fertile ones 

 more distant linear subacute, veins rather distant simple or 

 once or twice forked, sori broad costal, involucres broad 

 arched often ragged, rachis very (deciduously ?) paleaceous. 

 (Taij. CLX.)— "CVy. Deinoustr. 1801. n. G50." Sw. Sji. Fit. 

 p. 115. JVilld. Sp. PI. V. p. 41.3. Br. Prodr. p. 152. " Lomaria 

 scabra, Kaulf. in Sieb. Syn. Fil. n. 1 07, and in Sieb. FL Mixt. 

 n. 273 (frons uno latere fertilis, altero sterilis)," fide Presl. 

 Orthogramma kevigata, Presl, Epim. Bot. p. 121, Blechnum 

 ambiguum, Kaulf. n. sp. in Sieb. Syn. Fil. n. 106 {in Herb. 

 Nostr.). Parablechnum ambiguum, Pr. Epim. Bot. p. 109. 



Hab. N.S. Wales, Port Jackson, Broion, Sieber, Cloives. — This is a very dis- 

 tinct species of Blechnum, and appears to be confined to one locality. That it 

 is the Bl. ambiguum of Kaulfuss, MSS., in Syn. Fil. Sieb., is clear upon the au- 

 thority of Sieber's own specimens ; and, though I have not had the opportunity 

 of seeing Mr. Brown's original specitnen of his published Bl. levif/alum, it is 

 equally certain it is that species, notwithstanding that I'resl places these in two 

 different genera. The species is remarkable for the two forms of frond, the one 

 with broad, sterile pinn;v?, the other with narrow, fertile ones, and for the copious 

 pellucid dots in both. Mr. Brown describes the pinna; as " semidiaphanous ;" 

 they are sometimes remarkably so, but not unfrcquently they are coriaceous 

 and opaque, and the pellucid dots are then less distinctly visilde. In the more 

 perfect state of the plant the rachis is clothed with patent ferruginous scales, 

 but these are often deciduous. Although our specimens are generally dimor- 

 phous, yet we possess intermediate grades showing a passage from the one to 

 the otiier, and where the sori are on the broader pinna;, they are more distant 

 from the costa, and sometimes a receptacle, resembling a transverse vein, is dis- 

 tinctly formed, yet destitute of sori. One of our sterile fronds, only 10 inches 

 long, has tlie terminal pinna 7 inches in length and l:r inch broad. The margins 

 are everywhere a little thickened and subcartilaginous, and the veins are clubbed 

 at the apex, terminating each within a tooth or serrature. 



23. Bl. australe, L. ; caudex thick subrepent copiously 

 rooting, at the summit clothed with rather rigid glossy lan- 

 ceolate scales, stipes 4-G inches long, fronds 6 inches to 

 1-1^ foot uniform or nearly so pinnate, pinnae rather dis- 

 tant subfalcate deeply hastato-cordate or even subsagittate 

 at the base superior lobe or auricle generally the largest and 

 most acute, sterile pinntc oblong-lanceolate often obtuse 

 and mucronate the margin rough dotted within the margin, 

 fertile pinucC (often confined to the superior part of the 

 frond) linear-acuminate, sori near the costa continuous 



