.1894-] Undescribed Plants from Gtiatemala. ^ 13 



ous; petioles slender (1—2'''), triquetrous by produced nerves 

 of leaf, estriolate; leaves glabrate, the opposite somewhat un- 

 equal, obliquely oblong-elliptical (4-6.5 X 1-2*"), prolonged 

 to a slender (6-9^) and sharply serrate tip, base acute and 

 induplicate, serrate throughout, 3-nerved to apex, exterior 

 veins all equal and ascending to margin of incurved crena- 

 tions, interior veins anastomosing, veinlets finely reticulat- 

 ing, pellucid, upper surface striate with small cystoliths, the 

 lower glaucous: monoecious; staminate cymes geminate, 

 shorter than petiole (5-8 ^), peduncle bifurcate, flowers 

 single and racemose or few-clustered on long spreading 

 branches; perianth in aestivation oval (i ^) and exceedlng 

 pedicel, obtuse segments incrassate at the base and back, sta- 

 mens twlce longer, rudimentary ovary minutely subulate; 

 pistillate cymes from uppermost axils much smaller, in anthe- 

 sis conglomerate, broadly cucullate segment of perianth thick- 

 ened and exceeding the scarious exterior ones, ovary slend- 

 erly elliptical. — Intermediate between P. multijlora Wedd. 

 and P. falcata Liebm. — San Miguel Uspantan, alt. 6,500^ 

 April 1892, Heyde & Lux, no. 3,147- 



PiNUS Donnell-Smithii Mast., Botan. Gaz. 16; 199. 



ExPLANATioN OF Plate II. — Fig. I, portion of branch with leaf-scars. tufts 

 of leaves. primordial leaves and male flowers, nat. size.— Fig. 2, tuft of leaves 

 with sheath of leaf-scales at the base.— Fig. 3. portion of leaf magn. 4 times, 

 showing lines of stomata and serrations at the edge.— Fig. 3* , section of leaf 

 magn. 5odiam., showing epiderm, twolayersof hypo-orexoderm, stomata, meso- 

 phyll with sinuous cells. a triangular pericycle with well marked endoderm and 

 a branched fibro-vascular bundle with phloem towards the dorsal side of the 

 leaf and xylem towards the upper edge. Between the two masses of xylem 

 are several large libriform cells.— Fig. 4. primordial leaf or 'squama ftikrans'' 

 magn. ^diam. — Fig. 5. male flower isolated magn. 2 diam.— Fig. 6, stamen 

 from the front and from the back magn. 6diam.— Fig. 7. stamen from the 

 side magn. 6diam.— Fig. 8, pollen grain magn. 200 diam.— Fig. 9. ripecone. - 

 Fig. 10. longitudinal median section of cone.— Fig. u. detached scale of cone 

 showing apophysis and urabo.— Fig. 12, scale of cone seen from the side.— 



Fig. 13, youngseed. 



Dioscorea dicranandra. (§ Allactostemon Griseb. in FI. 



Bras.) — Glabrous in all parts: leaves orbicular-cordate (5-9 X- 

 4-7'°), abruptly acuminate, membranaceous, pale beneath, 

 pellucid-lineolate, nerves 7-9, the exterior pair l-furcate, 

 midrib somewhat exceeding stout petiole and thrice longer 

 than approximate basal lobes, sinus broad, transverse veins 

 distinct: spike^ solitary; or the fertile 3-5-fasciculate and oc- 

 casionally furcate, filiform (i^-i;'"), rachis angulate, bracts 

 broadly oval and long-acuminate, flowers solitary and sessile; 



