Plate XLIX. b- 



WILSON'S, or THE UNILATERAL FILM FERN 



(IIVMKNOI'IIVLI-UM ONILATERAIiE). 



HYMENOPHYLLIJM, Smith. 



Clusters of Spore-cases enclosed within ux.tra -marginal two-valved snb-nrceolate 

 involucres, of the same texture ns the frond, &pQre*e*t$cjt obliquely compressed, 

 with a transverse ring, sessile around the columnar receptacle, bursting verti- 

 cally. HecepUtdcs (extra-marginal extensions of the veins) free, and included 

 within tlio involucres, sub-clavato. Vriw disunited at their extremities, simple 

 or forked, 



H. unilaterale: fronds pel lucido-mem bran nccoug, pinnate, oblong-elongate or linear ; 

 pinna: decurvctl, sub-unilateral, digitatcly pinnatitid, slightly deeurrcnt funning 

 a narrow wing in the upper part of the rachis ; segments linear, undivided, or 

 bifid, spinulosely serrate j involucres axillary, solitary, stalked, ovate, inflated* 

 the valves entire. 



llTMEMirilTtXC*! mULaHElLB, Jtory 3IS.: UVUeno-r, Spreie* Ptonbtrn*t t x. 521 . AW***, Hittoro of JfritiA 



Fm* t 301. Jtotre, Handbook of RrtiitA Ferns, 'A>9. Stteeetf, Fertu of Great JSritoin, 7&\ t. 4JI. 



Sprt*f*t t Sfttem* Veprttilitiut*, k. 133 + Pretl, IfynrnoplfUa*e*r r a* Hooter Jtt t Flora efXrie Ze*la*J, 

 ii. 11* 



Ihui^nuuiu Wuaom. Hooter, IlritM FUrn, 1 &!., -150; Speck* Fitknm, i* 93. Wilton, Supplement to 

 FmolUh Boto*$ t t. 2SS0. Hooker end Artott, Brttii* FUro, $*:. MotUy t Ftors 7/fttrniM, 3tt. BoUnp 

 ton, M****lofftriM Bot*oy, 41fl, Ik****, F!oryr*f*™ JfrfcaWfla, iv t 121, Pre*l, HjmenopljUot**, 31. 



HtutNortuu-iu TpyniinoiSK, ^taMiraV. Krypt4$o*nUe** {frmirAae, VM, t, Itt5 rf (exeL arn.), 



II VMisoniTLMjM TnwnaioorpaB j3, Ku*;e t Linn**, x. *V»lt. 



HTHXXOFVTIXra PKLTATCH, fA'irtftfr, ProJromn* t 33 ; aortroiHg to Hooker. 



lltu»oriiTLLiu UffifZEBOi /VW, }fymenopljtt*tr*r t 31, 51 ; acconling to Hooker. 



HTUiyorJITLMTU MlTtKI, Fred, JfynentflvlUteiti 31. flOj aecoftling to Houlitir 



TMCOOaUtt* rr.LTATuaf, ZWrf, EneyrhpAKei }Jot**&ione, rm, 421 ; neeontiitf l« Hooker. 



Tj:KUOUAM:* TUMOIOtXiE, iteJtoa, Fitter* ffritonme*, ftS, I. 31, 



EXPLANATION OF THE PLATE, 

 Plate XLIX. fc**HFin?ioriiTi,Li:*i \ > i \ ■ir; from \Vini!ennrc\% Wentmorvlnnil ; f. (.V*#w* 



If AIHTATV- Ttw apoeica b more oateomely dutributed than //. tnMMJptnte, though tho two plintt ury frequently oecur 

 tu eocajtcuiy. The nre*cnl ii met with in the aoullt*wett of Ktighmi. and ii reported from wteral miilLmi! eotinliea. 

 Both North and South Wato produeo it i Aod in tte north of Kntfino^ capocuHv in the Like ltiitriet in the north- 

 we»t, it beco-ao |tlentifaL It h Ike commoner of the two p(torie» in Soolbud, o<vurnng both in ibn l.onLit^U *m\ 

 llifihlaod' a* far north *i $utherUad>hire p nod extending ereu to the Northern find Western li!e«. In Ireland it 

 oeeurs ulentifallv, ind in ill tn« ncwinei**. In allitudinal ran^e ihi* ttlnnt U found from the eoxtt Ictcl to on 

 titration of npwArdi of 2700 feet, which it attain* in tlw* Hebrides aeeordin? to tSe ob**rritionf 0/ Dr. tblfour am! 

 Mr. Ifftblnglon. 



GEOGRAPHICAL DISTItl BUTION,— Tht» jdant ownr* in IU north of Kuroj^ in Norway, and the Faroe bland*; and i* 

 probably r^enerallr ditfieractl over Enrope, bnt iU reconL are eeaotj. We bare mot uith no Asiatic tpeeimeop. 

 It i* T honeieTj fonnd in tke Uland of Ilonrbon and in S^ith Africa 1 in the latter auuming a ^rnetthat thtTrrvnt form, 

 the aefiiienti being narrower. It ik Ofiin met with towanU the extremity of *he South Atnr-rioan eontinrnt, in 

 lWta iW Kue«o, at Valdirb, at Cape Horn, and in the Falkland IaU[id*.(//A. Hotkt* and JAi*#. JleiL). It ia 

 alao fonnd nbimdantly in Tnamania (//*. Hooker) ; ar*d f apparently »earee t in New Steahnd. 



Rhizome rigid, filiform, <Inrk brown, creeping, branched, ami forming dense entangled masses; 

 bearing a few hair-like scales about the buses of the fronda Ftbr& slender, downy. 



Stipe* slender, wiry, terete, varying in length, one-third the length of the frond, often less ; distant 

 and lateral on the rhizome, and adherent to it Itacftis tercto below, narrowly-winged above. 



[OT/rfww circulate- 







