176 Blackburn. — On the Vascular Anatomy of 
similar to that in the plumule, is formed in the hypocotyl as in Decaisnea y 
but in Magnolia passes into a tetrarch root (see Thomas, loc. cit., p. 710). 
M. Soulangeana is similar to M. acuminata. 
Liriodendron Tulipifera. The seedling is smaller and the foliage leaves, 
which are nearly orbicular, show the apical depression characteristic 
of the species. The petioles have a ring of four strands, of which the 
adaxial one bifurcates and the halves rotate to join the central strand 
within the petiole. The leaf-trace strands are thus reduced to three. The 
stipules are not completely sheathing and show no vascular strand. Other- 
wise the anatomy is similar to that found in Magnolia , except that the 
intercotyledonary poles die out in the hypocotyl as described by 
Dr. Thomas. 1 
Calycanthaceae. 
Calycanthus praecox. The cylinder of this plant seems to be quite 
normal. In the cortex are the well-known four inverted bundles formed by 
the lateral strands from the leaves. Only the central strand of the five 
leaf-trace strands, described by Mr. Worsdell, is inserted on the stem 
cylinder. 
As described by Mr. Worsdell, 2 the arrangement of the cortical bundles 
is similar in the seedling ; they finally insert themselves on the cotyledonary 
strands at the node. In the seedlings examined the number of leaf traces 
was three instead of the five described for the adult plant. The features of 
the main cylinder, cotyledonary node, and hypocotyl are similar to those of 
Decaisnea except for the formation of a tetrarch root. 
Although the leaves even in the seedling are opposite, the foliar organs 
on the peduncle, as pointed out by Worsdell, 3 are spirally arranged. This, 
he points out, is suggestive in the light of the discovery by Baillon 4 of an 
exceptional plant of Chimonarithus in which the leaves are arranged on 
a two-fifths phyllotaxy. 
Anonaceae. 
Anona. The adult vascular cylinder appears to be quite normal. 
Sinnott states 5 that the leaf-trace insertion is unilacunar though it consists 
of three strands. The phyllotaxy is one-half. Seedlings of two species have 
been examined. Germination is hypogeal, and the plumular internodes are 
long. 
A. reticulata. The three strands from the plumular leaves have 
trilacunar insertion. The lateral strands are inserted near to the median 
strand, but not in the same gap. The structure of the epicotyl differs from 
1 Loc. cit., p. 710. 2 Loc. cit., p. 669. 3 Loc. cit., p. 669. 
4 Baillon : Sur un Chimonanthus a feuilles alternes. Adansonia, vol. ix, 1868-70. 
5 Loc. cit., p. 312. 
