62 



6, two fragments of leaves which have not any relation to this species, and 

 appear, by the enlarged base, to belong to a type related to our Betula lutea, 

 Michx. The specimens however are fragmentary, and the affinity of these 

 leaves is uncertain. 



Habitat. — Near Beatrice, South Nebraska, Hayden. All the specimens 

 are from the same place. 



Alnus kanseana, sp. nov., PL xxx, Fig. 8. 



Leaf thickish, round-oval, rounded and narrowed to the slightly attenuated subcordato base, and 

 above to an obtuse point, entire or marked by a few obscure teeth in the upper part; lateral veins 

 parallel and mostly opposite, the lowest camptodrorno, the upper ones entering the teeth ; nervilles 

 thick, in right angle to the veins. 



The leaf is 4 centimeters long, 2,\ centimeters broad in the middle, 

 its widest part; round-oval, with borders undulate from above the middle 

 downwards, slightly obtusely dentate toward the obtuse point, with seven 

 to eight pairs of thick lateral veins, mostly opposite, passing up from the 

 middle nerve under a broad angle of divergence of 60°, the lower veins 

 curving along the borders, the superior ones entering the teeth by their 

 point or their divisions. The veins are all at ecpial distance and parallel, 

 except the lowest pair attached to the medial nerve a little above the base of 

 the leaf, and somewhat more open than the others. The nervilles, at right 

 angle to the veins, are strongly inflated at their point of connection to the 

 veins, forming by subdivision at right angle, a rough quadrate areolation. By 

 its outline, this leaf resembles the small forms of Alnus viridis, differing how- 

 ever by the borders mostly entire, and by the nervation. By this last char- 

 acter it has some affinity to Alnus gracilis, Ung„ which has sometimes, as in 

 Fig. 4, PL xv of Bil. Flora, the borders entire from the middle downwards, 

 and the lowest pair of veins camptodrome. 



Habitat. — Kansas ; found in concretions, by Professor Mudge. 



Alnites quadrangularis, Lesqx., PL, iv, Fig. 1. 



Leaf subcoriaceous, small, broadly rhomboidal in outline, with obtuse angles; borders undulate 

 entire, rounded to a thick, short (broken) patiole; nervation pinnate; veins craspedodrome. 



Populites quadrangularis, Lesqx., American Journal of Science and Arts, loc 

 cit., p. 94. 



The leaf is 38 millimeters long and about as broad ; the secondary veins, 

 seven pairs, at an open angle of divergence 50°, are thick, at least toward the 

 base, parallel, alternate, going nearly straight to the borders, mostly simple. 



