A NEW PHILODKNDRON 277 



proposes the name athintienm, and has drawn up the following 

 description : — 



^ H. FLUiTANS L. {amphibium) var. atlanticum Ren. Forme 

 voisine de la var. Jeanhemati Ren., dont elle dififere par la couleur 

 verte, le tissu chlorophyllieu, les feuilles plus larges, ovales puis 

 rapidement retrecies en un acumen court; nervure un peu plus large 

 (58-64 fx au lieu de 46-48 /x), tissu basilaire plus lache, cellules 

 moyennes plus larges et plus courtes. 



Hab. England: R. Wyre, West Lanes., coll. Albert Wilson, 

 1900 {Wheldon, No. 9). Summit of Pendle Hill, Lanes., alt. 

 600 met., coll. J. A. Wheldon, July, 1898. 



France : Meymac (Correze), alt. 900 met., coll. Lachenaud, 1901. 



Forma r/racilis Ren. Plante plus grele, feuilles plus petites mais 

 de meme forme que le type, nervure plus etroite, tissu plus lache 

 que dans la var. Jeanhemati. 



Hab. England: Arucliffe Wood, Yorkshire, 1900, coll. W. 

 Ingham {Wheldon, No. 19). 



Prof. Barker, I may add, sends me the var. atlanticuni from 

 North Derbyshire, where he says it occurs abundantly on some of 

 the moorlands. In some parts of Lancashire Mr. Wheldon finds it 

 one of the most predominant forms of H, fiuitans. 



A NEW PHILODENDROy. 



By a. B. Rendle, M.A., D.Sc. 



Philodendron crassum, sp. uov. 



Herba caudice brevi crasso procumbente ; foliis confertis, 

 petiolo I lamina vix aequante, crassissimo, subfusiforme subterete, 

 facie autem superiore pauUo concavo cum acietibus marginalibus 

 brevibus ; lamina elliptico-ovata ad subellipticam, apice apiculata, 

 supra nitida, costa apicem versus cito evanescente, nervis laterali- 

 bus subasqualibus ascendentibus ; peduuculo dimidium spath^ vix 

 superante ; spatha suboblonga obtusa ad basin evoluta, intus e 

 fundo purpurea, superne albida ; spadice spatham aequante, parte 

 foeminea masculae dimidiam partem sub^quante, parte mascula 

 sterili quam feminea breviore, staminodiis ovaria excedentibus 

 infimis clavatis ; ovariis plurilocularibus, ovulis paucis, stigmatibus 

 late capitatis ; staminibus ovaria excedentibus. 



A plant with the habit of P. cannafoiium Mart. The adult 

 leaves have a leaf-stalk 22-23 cm. long with the greatest thickness 

 4-2 cm. about one-third the distance above the base, narrowing to 

 about 1-6 cm. just below the blade ; the shallowly concave upper 

 surface reaches 3 cm. in width at the thickest part ; it is bounded 

 by low subacute edges. The blade reaches 36 cm. in length by 

 17 cm. in width below the middle ; it shows no pre-eminent 

 secondary veins. The petiole has a spongy internal structure, with 

 the intercellular spaces lined with mucilage. The spathe is 13-5 cm. 



