112 NOTKS ON KIJIAN I'l.ANTS PENH AI,1,()\V. 



(Ik'sc steins sliow morc^ oi' loss well (Icliiicd imd pcil't'ct l;ittM;\l rows ol' 

 8cal(V^ wliicli jirc (riaiiuiiliir, iiciito, l""" bi'oad at tlio base aiidL*""" \o\\}X. 

 In the larger stems llu^ scales bci-ome sonicwliat laiiicr. 'riicre arc few 

 siirl'acH^ ina.rkiiiii's, luii where they occur Micy arc (lie same as in No. 32. 

 No. .■>!* is chiclly represented by a braiicliiiii;" stem 5""" M'ide and 21"" 

 lonji'. The branch separates I'roiii the main stem by a. somewhat nar- 

 row an, i^le, a. ieature which ehanie-tbri/ea nearly all the tVaji^ineiits on 

 these thie(^ slabs. Laieral rows of scales are prominent. ^Pliese are 

 trian,i;iilar, aenle, 1""" Ion-;- by 0.5""" broad at (lie base, and are clostdy 

 afran.yed. This stem does not sliowany well delined surCaee markings. 



There are also numerous shoit iVa.uuK'nts ol" stems. One ol' these is 

 1""" broad and braiudiin.u', and is an undoubted /*,s'//(>/i/////o;/. Other 

 pieces show somewhat obscure superficial mail;iii,i;s in tlie form of pits 

 sindlar to tlios(> in rsilophi/hni rohiistius ami /'. in-iiicrps. Others aiiaiu 

 show distinct transverse markings, Avhicli are triani;ular, acute, 1""' 

 broad at the base and 2"'"' lonn'. They are undoubtedly to be regarded 

 as the scales of tlie stems turned over and tlat toned down upon it 

 transversely to its axis. From their r(>lativ»' i)ositious, it is i)robable 

 that the scales are disposed sj^irally. 



I'^rtun these «letails it would seem clear that the plant in (piestioii 

 nuist be a I*sil()plii/l<)n, but dilVerinji' materially from those already 

 described,* ehielly in point of siz-e and in the size and aujiiejiation of 

 the scales. 1 would, therefore, j>roi)ose for it tlu> name of I'silopJii/ton 

 //>vf»f//.s', as it wasobviously a i)lant of much larger dimensions than any 

 of the hitherto known species. 



Upon the data thus ])resented, tiu^ followiiii;- classiticatiou becomes 

 admissible. 



(i(Muis HALISERITES St. rub. 



l-'ronds i»laiie, membraiiai'cous, costate and dicholomous tlirouiihout; 

 the mor(> or lesslincai- ramuli with simple ttMiniuatious, Sptwauiiia in 

 f;roups lateral to the midrib. 



Haliseiites Dechenianiis (i;)])p. 



Fronds r(\i;ularly dichotomous; the divisions liiu'ar, o"'"'or more wide; 

 niariiins reuular or wa\y. terminations strict. An,i>ies of divergence 

 about K) \ I'iipmlly and strou.uly costate throu.uhout. 



Haliserites Dechenianiis (itipp., v;ir. lineatiis, iiov. var. 



l-'roiuls reuularly dichotomous throniihout ; di\isions linear, often 

 sonuMvhat narrower at the base, 2.2.")""" broad. l>i\-er,U('nce of members 

 40 '.margins ri'uular, midrib well delined Ihrouiihout, but not prominent. 



•l)a\vsoii: I'oss. I'lauls of (ho Dov.aiitl 1.811 ol' (anatla, (ioologitalSvivv . of Can- 

 iida, IS71, pp. :>7-n, I'l. IX, X. 



