10 \V(n'd Species of Cycadeoideafrom Munjloml. 



meters in longer and 12 to 26 centimeters in shorter diameter, with a girth 

 of from 70 centimeters to one meter; organs constituting the armor pro 

 ceeding at a right angle to the axis except above, where they are ascending, 

 and near the base, where they are sometimes slightly descending ; leaf 

 scars arranged in two series of spiral rows crossing each other usually at 

 a different angle to the axis of the trunk, the angle varying from 30 to 

 75; scars usually subrhombic, i. e., with the lateral angles nearly equal 

 and the vertical ones unequal, the lower more acute than the upper, the 

 latter often reduced to a mere groove or wanting entirely and the two 

 upper sides together forming an arch, the whole scar simulating a drawn 

 bow and bowstring, but sometimes triangular, the upper sides joined along 

 a horizontal line, or more irregular in shape, occasional!} 7 with four curved 

 sides and four acute angles; the width as represented by a line joining 

 the two lateral angles varying from 15 to 25 millimeters, and the height 

 as represented by a line joining the two vertical angles (which would 

 rarely be parallel to the axis of the trunk) varying from 6 to 15 milli 

 meters ; remains of the petioles usually present in the scars at differ 

 ent distances from the summit, often bearing evidence of having been 

 disarticulated at a natural joint, sometimes indicating the existence of 

 two such joints at different depths in the scars, and showing that these 

 joints consist of a diaphragm across the petiole which may remain after 

 the substance of the petiole has partly decayed below it leaving a hollow 

 space, portions of the outermost diaphragms also sometimes adhering 

 to the sides of the scars in the form of a ridge surrounding them ; vascular 

 bundles rarely visible under an ordinary lens, but occasionally seen in 

 the form of a row near the outer margin all round the leaf base with a 

 few near the center; ramentum walls usually rather thick, but vary 

 ing from less than L millimeter to 9 millimeters, ordinarily with a more 

 or less distinct line marking the junction of the parts belonging to ad 

 jacent petioles (commissure), sometimes with a distinct plate or layer of 

 less compact tissue between these, occasionally but rarely affected with 

 pits or small bract scars especially in the angles; reproductive organs 

 usually abundant, often solid and protruding, generally more or less dis 

 tinctly marked in the center by the remains of the essential organs and 

 surrounded by bract scars in several concentric rows, but often decayed 

 in various degrees, leaving corresponding funnel-shaped cavities, com 

 monly elliptical in cross-section, wider than high, very variable in size, 

 the major axis 15 to 40 millimeters and the minor 10 to 30 millimeters ; 

 armor thin, 2 to 5 centimeters, usually joined to the internal parts by a 

 clear line, but without measurable thickness, but sometimes very irregu 

 larly so joined and occasionally showing a thin libro-cambium layer; 

 woody zone 3 to 10 centimeters thick, usually with two or three more or 

 less distinct rings, the outer or parenchymatous zone thicker and firmer 

 than the inner or fibrovascular zone ; medulla usually homogeneous in 

 structure, elliptical, the major axis 8 to 17 centimeters, the minor 3 to 9 

 centimeters. 



Eighteen specimens are referred to this species. The type specimens 

 are of course the originals of Tyson, of which the one photographed by 



