— 481 — 
Festschr. P. Ascherson’s Siebz. Geburtstag, 1904, p. 48; 
Derby, Jor. do Commercio, Rio de Janeiro, Marco 13, 1906, 
p. 1; Arber, The Glossopteris Flora, 1905, p. 448, pl. VII. 
Woody cylinder surrounded by a continuous sclerenchymatous 
sheath ; pertpheral steles 4 in number, separated from the central 
region for a part of their extent by sclerenchymatous bands, and 
strongly inrolied at the extremities which sometimes loop back:oard 
nearly to the middle. Behind cach of the four. outer steles is a 
radial series of 2 or 3? stronyly arched steles, some of which some- 
times divide again, or in other instances unite to form a complete 
ring. Alternating between these steles, and sometimes joined to 
them, are other bands which are more or less arched, the outer 
ones being broader than those nearer the center of the trunk ; 
leaves in four vertical rows, probably in opposite or subopposite 
pairs ; axis of the adventitious root formed of 6—-8 broadly con Nuent 
bundles ; conjunctive tissue of the radicular ring continuous with 
that of the trunk; inner cortex not lacunose, but appearing to 
carry gum canals in a varyning number more or less regularly 
arranged in a circle. 
Psaronius brasiliensis is not represented in the collections made 
by the Commission. The material described by Brogniart in the 
Museum d’Hisioire Naturelle at Paris has been very fully treated by 
Professor Zeiller (1) from whose diagnosis the above description is 
extracted. The London specimens have been re-described and illus- 
trated by Arber. (2) The specimen figured by Unger is said to 
have been collected by Martius between Oeiras and San Goncalo 
d’Amarante, in the state of Piauhy. 
The investigations made by Count Solms-Laubach show that 
the specimens containing portions of the inner cylinder, now in 
Paris, London and Strasburg were all derived from the large segment 
of a trunk now in the Museum at Rio de Janeiro. The source of 
this trunk appears to be in doubt, but it is thought probable that 
it came from Sado Paulo or Rio Grande do Sul in Southern Brazil, 
as indeed, in the opinion of Doctor Derby, may also the original 
(1) Fl. foss. bassin houill. ct perm, Autun et Epinac,, pt. 1, 1890, p, 246, 
(2) The Glossopteris Flora, 1905, p. 148, pl. VII, 
