232 
Boodle and Worsdell. — On the 
In 1835 there appeared a short thesis by Stache 1 on living 
and fossil Casuarineae. 
Sanio 2 , in i860, in a long paper on the formation of cork 
in various plants, describes minutely the development of the 
periderm in Casuarina y giving a very clear figure showing the 
mode in which it cuts off the ridge of assimilating tissue from 
the main stem. In a subsequent series of valuable papers 3 , 
in which he describes the different elements which compose 
the woody tissues of plants, he gives repeated references to 
Casnarina , of which the most important are those in which 
the nature and morphology of the fibrous tracheides and 
parenchymatous tissues are touched upon. 
By far the most detailed and fullest account of the anatomy 
of these plants is found in a long thesis by Loew 4 , pub- 
lished in 1865. Without following the paper through all the 
points it touches upon, we will just mention that the author 
has a long chapter on the subject of the medullary rays 
and the concentric bands of parenchyma, and he speaks of 
the ridge of assimilating tissue as being beyond dispute of the 
nature of a leaf, while he gives a short, though exact descrip- 
tion, which no other author has done, of those elements in 
the ridge, which we, in the following pages, have described as 
‘ transfusion-tissue.’ 
Poisson’s paper 5 , which came out in 1874, is largely taken 
up with reviewing and summarizing the results of Loew’s 
investigations, stating, as the most original part of that author’s 
work, his attempt to classify the Casuarinas according to the 
form and structure of the ridges or c phyllichnia ’ ; the second 
part of the paper is a description of the reproductive organs, 
and a monograph of the genus, which he separates into two 
divisions : Cylindricae or Cryptostornae, and Tetragonae or 
Gymnostomae. 
1 De Casuar. nunc viv. et foss. nonn., Vratisl., 1855. 
2 Jahrb. fur wissenschaftl. Bot., i860, Vol. ii, p. 103. 
3 Bot. Zeitung, 1863. 
4 De Casuar. caul. fol. evolut. et struct. Berol., 1865. 
5 Recherches sur les Casuarina, Nouv. Arch, du Museum, Vol. x, 1874. 
