Noteworthy anatomical and physiological researches. 
Anatomy of Vellozieae.} 
The Vellozizae, a tribe of Amaryllidaceae, are known from 
South America and Africa, but have their largest distribution 
in Brazil. Only two genera, Vellozia and Barbacenia, con- 
stitute the tribe, and these are all perennial, with erect stems, 
branching dichotomously. The leaves are long, erect and 
linear, more or less carinate, are provided with large sheaths, 
and form fascicles at the upper part of the branches. The 
height of certain species averages two meters. The most 
characteristic feature, however, is the thick coating of roots in 
Vellozia, which develop from the stem and proceed within the 
leaf-sheaths towards the ground. The roots are thus only 
visible at the base of the trunk, when the old sheaths have 
faded away. 
A transverse section of the trunk of Vel/ozia is round and 
shows a few relatively thin and triangular branches, surrounded 
by a huge mass of roots. The anatomical structure of these 
roots is identical with that of a normal monocotyledonous 
root, but the vessels are often filled with a brown or yellow 
substance, probably a kind of resin, especially abundant in 
Vellozia. The central part of the root is occupied by a heavy 
layer of exceedingly thick walled stereome. The endodermis 
is thin walled, sometimes starch bearing. The inner bark has 
an open, loose structure, and is surrounded by the outer bark, 
which is here composed of a cylindric layer of stereomatic 
tissue 
Outside these tissues is a hypoderm of a single stratum of 
thin-walled cells and finally the epidermis, which sometimes 
develops root-hairs. The hypoderm is stained blue by iodine 
and sulphuric acid. 
The peculiar feature of the roots extending along the stem 
Within the leaf-sheaths seems to be common in the genus 
ure from Ho and rains. This explanation is the more evi- 
dently correct when we consider the localities in which the 
} “1War Eug ote sur la biologie et l'anatomie de la feuille des Vel- 
osiackes, "eatriie du Dall l’Acad. roy, d. Sc. Copenhague 1893). 
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