268 WARD 



exposed in one specimen, showing large scars of the medullary rays, 

 consisting of elongated alternating depressions, io-i5mm long, 5-8mm 

 wide, each with a raised point or cushion above the middle; medulla 

 4cm in diameter, hard, fine-grained, and homogeneous. 



This species consists of Nos. 500.63 and 500.76, which seem to 

 belong to the same trunk but are not exactly contiguous. They prob- 

 ably belong end on end. No. 500.62 being the upper segment and 

 reaching nearly to the apex of the trunk, while No. 500.76 falls con- 

 siderably short of reaching the base. The trunk probably had a height 

 of about 20cm. No. 500.62 has lost the medulla, thus exposing the 

 inner wall of the woody axis as described. Both specimens are nearly 

 covered without by the coating of ramentum and the transverse frac- 

 tures reveal its nature better than in any other specimens in the col- 

 lection. One of these surfaces (the upper fracture of No. 500.76) has 

 been cut across and polished, and microscopic slides prepared from the 

 region which most clearly shows the transition of the ramentum to the 

 outer investiture (see PI. XIV). This polished surface was photo- 

 graphed natural size and also enlarged four times linear, and the most 

 instructive portions of the enlarged view have been selected to illustrate 

 the behavior of the ramentaceous chaff in forming the external layer. 



On account of the great interest taken by Dr, F. H. Knowlton in 

 the question of the true nature of this peculiar generic character, the 

 material assistance he has rendered me in preparing and examining 

 microscopic slides illustrating it, and the fact that the most successful 

 of these investigations have been made on specimens of this species, I 

 have thought it a proper recognition of his services that the species 

 should bear his name. 



The weight of No. 500.62 is 1.22, and that of No, 500.76 (before 

 cutting) 1.39 kilograms. 



PI. XVIII, Fig. 2, and Pis. XIX and XX, illustrate the instructive 

 specimen No. 500.76. The polished surface of the upper transverse 

 fracture, from which the microscopic slides were taken, is represented 

 by PI. XVIII, Fig. 2. The figure is somewhat enlarged and even here 

 the origin of the ramentum from the sides of the leaf bases is distinctly 

 visible without a lens. The line dividing the armor from the outer 

 layer is clear and a good general idea of the nature of the latter can be 

 gained from this view. The irregular attachment of the armor to the 

 axis is also well shown. 



Pis. XIX and XX represent two areas of the polished upper transverse 

 plane enlarged four diameters. An inspection of PI. XVIII, Fig. 2, 

 shows that there is a short interval near the center of the specimen over 



