I 





I 



Plate VI 



THE LIMESTONE POLYPODY (Polypodidm Robertundm). 



POLYPODIUM, lAnnwm. 



Clusters of Spore-cases circular, without covers, growing front the back of the veins, 

 terminal, or nearly so. Veins disunited at their extremities, their branches 

 (venules) simple, forked or rarely pinnate. 



P. Robertiakuh: fropds erect, rigid, glandulosc, pentangular, deltoid, subternnte ; lower 

 branches (or pinn*e> bipinnatc, stalked, their piimulets (or lobulcte) oblong obtuse, 

 crcnate or nearly entire ; the rest sessile ; stipes glandulose, 



POLTMDEUtf ttomnarcv, &&»***, Fhrt fo UAU*m*jm % in nddctiia (170^1 \ ntvttcUanJt FLm 5 1ft 

 if***. fUaJlnk o/XritiA Frr** t 2 *i. W. ? ' 



PMmmra CaUlHrv, Afttt, ft*. M-*^ 1117 (ISOI) ; Em $ lUh Jht<my> "». t. 1525 ; &jji7* Phr* t 



2«*,fr.H0. J*M* t FMsr*pAhBriismii«m>xr.4& Ilertrr «nJ Ar**t t Brituk J?**, *U JMintom 

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PoLtromni Daromftii.TAE.: ltdton, Nim tiritonmt**, & t uL ^. Ci^Jbtaytf-a* Arffcrji kjmi 



&#to, €23* 

 Ntrnaoiuru DrrorTEnii, Mk&*ux, Ftors Itwntt<jneric*m t iL 270. 



L**rn** auttBaU, Ikry, ttrfiW^ Cl<uH^* ^ UUtoirt X*t m lU t «, 233. ,\>™«« AMa-nta-J ^/muc 

 1044,17. 



LuiUl Ro*HTU*A, Artratrt**, Itrititb Ftrmt, 2 ed.. 17. 



OravocAmniRoaiBraasinr,.^^ ^ 



rnrM>]»MRi4 CiUAin i, /», Cmra Aftout, 2-13. 



EXPLANATION OF THE PLATE, 

 Puts VL— FotTMfttra Uo»ttruxvii ; fram Lydbrook, Glouwitmliuv, W* //. ^^ 



HABITAT.— ThU tpoeie* in not known to oceur in Ireland, in Scotland with the adjaeonl I*lr*, or m tho oatfero «-ouiilten or 

 England j but it In found plentifully in varolii other part* of England, from Some rarUhirc in the aonttwnt, to l>urham 

 in the north; id the former district it deaorndi to about 250 feet nbore the boo, and In th* north aacondi to 000 feet 

 or upward*. It abo oecura plentifully near Mrrlhyr Tydi-il and at other plaeee in WaJea. Tao calcarooua iilla of 

 Qlooeeaterabire recta t« bo it* headquarter?. It octiirs we belicro excluitirlr on *ipoaed roelr lia^tooo tracts 



GEOGRAPHICAL lHSTmHL'TlON\-lnc]ibnt app™ 



in Norway, in England, in France, in Switzerland, in varioua parti e*f Germany, and in Hungary. In Amia, it hi* 

 boon fi»llwrrj by Dra. Hooker and Thornton in Ibo Himalaya mountain* at an deration of 5-5000 fevt <//** //oji<r) t 

 In North Aiiirrwi it owitra Udh in the United State* (//*. /.i*JUy), and iu Canada. 



Rhizome creeping extensively, branched, thicker than a straw, dark-brown, scaly. Settles pale- 

 brown, scruitrnnsparcnt, lanceolate. Fibres dark-brown, branched, clothed with a brighter brown 

 cobwebby pubescence. 



Stipes longer than the frond, often twice as long, stoutish, succulent when young, becoming stiff 

 and erect, abundantly scaly about the base, and with a few scattered deciduous scales upwards when 

 young, minutely glandular, pale watery-green, dulled by the glandulosity of the surface; lateral to the 

 rhizome, distinct, adherent Radii* glandulosc, the part forming a stalk to the lower plume much 

 shorter, and distinctly smaller, than that between the first and second pain of pitman 



Vernation circmate ; the pinnules rolled up separately into little globules, the pinna* then rolled each 

 separate inwards towards the main rachis, which is next iUelf coiled up. 



Fronds six to eighteen inches in height, including the stipes, which is usually more thau half, 

 sometimes two-thirds at Icastv of the length ; erect, of a linn herbaceous texture, deep dull grayish- 

 grecn, glandulosc, deltoid ly-pcntaitgu lav, but with the (tcntngoii less manifest thau iu 1\ Dryoptsm, in 

 consequence of the leas coni|wirative length of the stalks of the lower pinme* The fronds are not truly 

 ternate, though the larger size of the lower pin mo gives them a subtcmatc appearance ; they arc 





^ A 



