THE CARBONIFEROUS FLORA. 



165 



thu 



MarkinfjH of Sfrm. — Ij('iif-l)asfts lonj? f)val, pf>ititfi(l ut erxls, on- 

 liirfxirig with growth <>! aU'in. Lwif-scurs contrul, rhornhic, trans- 

 vor,s«. 



LenvpH. — Orift-rKTvcd, ntnitcly pointed, from four inchos in hiiigth 

 on tlif! iarj^cr hrancJics to one inch or less on thf; braruihict.s. 



FnirlificalioH, — C'orutH larf^e. cyiindrifal or lon^ oval, with larp^o 

 Hcales of tri^^onal form, and not (!lf)nKat('d but iyiii;? <;1ok(! to the sur- 

 face. IJornc on lateral, slendtT hranchlets, with Hhort leaves. 



OenuH Iji:i'inoi'iii,oio.s, StcrnbiTi,'; ri.oiiKNUKoN, L, and II.; 

 LoMAToi'Hi.o/os, (.'ordu. 



LcpidophloioH. — Under this gciiuirifj name, established by Stern- 

 berg^, I include those Ivcojjodiaceous trees of the coal-measures 

 which hav(! thick branches, transvcirsely e!on{,'at(!(l leaf-scars, eiu;h 

 with three vascular j)oints and phuied on elevated or scale-like pro- 

 tulM!ratices, long on»!-nerv(!d leaves, and larfje lateral strol)il(;s in vc^r- 

 tloal rows or spirally disposed. Tlu-'ir strur/ture reseirdiles that of 

 Lfpidwictidron, consisting? of a Sli'rnbcrfjid pith, a slemler axis of 

 large scalariforrn vessels, giving off from its surfac*; biiiidh^s of 

 smaller vesscsls to the leaves, a very thi<:k c<'llular bark, atid a thin 

 dense out<!r bark, having some elongated cells or l)ast-tissuc on its 

 inner side. In these tnses the exogenous outer (cylinder is less de- 

 veloped tlwui in the Lcpidodendra, and is sometiin(!s wanting in 

 stems or branches of some thickness. 



Jtegarding L. laricinum of Sternberg as the ty[)C of the genus, 

 and taking in connection with this the species described by (loldc'n- 

 Iwrg, and my own obs(Tvations on num(;rous s[)ecimens found in 

 Nova Scotia, I have no d<;ubt that LorndlophloioH cruHHiaiuliH of 

 Corda, and other species of that g(!nus described by Ooldenberg, 

 U lodi'.ndron and Jiothrodcndron of Lindley, Jjcpidodcndron ornatis- 

 aimum of IJrongniart, and I/rdonin ptuiclata of (icinilz, all Iw^long 

 to this genus, and differ from each otlutr only in conditions of 

 growth and pn;servation. Several of the ^)^'.i•'\^\n of LopidoHtrobua 

 and Lcpidophylliim also belong to Lepidophloion, 



The species of Lrpiilo/t/doios are rca<Iily flistiiiguisheil from 

 Lepidddcndi'on by the; form of t he arcoles, and by the round scars on 

 the stem, whi«'h usually nuirk the insertion of the large strobiles* 

 though in barren stems they may also have produced branches; still, 

 the fact of my finding the strobiles in hi'/u in (,n(; instance, the ac- 

 curate resemblance which the scars bear to those left by the cones of 

 the red pine when l)orne on thick branches, and the actual im[)res- 

 fiions of the radiating scales in some specinien;}, leave no doubt in my 



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