Comparative Anatomy of the Casnarineae . 233 
Schube 1 i in a dissertation on the anatomy of leafless 
plants, devotes a little space to the description of the 
assimilating stem of Casuarina. 
One of the most interesting treatises on the subject of 
Casuarina is the paper by Lecomte 2 in 1886, in which is 
a concise account of the main features of the stem-structure. 
Although he refers frequently to Loew’s paper with regard 
to other matters, when he comes to indicate, in a rather 
obscure way, the presence of the ‘transfusion-tissue/ there 
is no reference whatever to that author’s more complete 
account of this same tissue. He accounts, in an adequate 
manner, which Goeppert had failed to do, for the appearance 
of the tracheides in the large medullary ray, and finally refers 
to the investigations of Sanio and Poisson with regard to the 
formation of cork in the young stem. 
A paper by H. Ross 3 , on the assimilating tissue and cork- 
formation of various leafless plants, has a few pages devoted 
to Casuarina , which are chiefly occupied with a consideration 
of the periderm-structure. We have had occasion, during 
our investigations of Casuarina , to refer several times to 
Solereder’s 4 important classification of Dicotyledonous plants 
according to the structure of their wood. Though it is little 
more than a grouping together of plants having certain 
characters in common, it affords an excellent table of refer- 
ence ; while, in its minute investigation of the structure of 
the separate elements which make up the wood, it has also 
an important and valuable bearing on the subject of our 
work. 
Last year there appeared a paper by C. Houlbert 5 , entitled 
Recherches sur le bois secondaire des Apetales, in which 
he shortly describes the anatomy of various species of 
Casuarina , and attempts to give that genus a systematic 
1 Beitr. zur Kenntn. der Anat. blattarmer Pflanzen, 1885. 
2 Bullet de la Soc. Bot. de France, Vol. viii, 1886. 
3 Nuovo Giorn. Bot. Ital., Vol. xxi, 1889. 
4 Ueb. d. systemat. Werth d. Holzstruct. b. d. Dicot., 1885. 
5 Ann. des Sci. Nat., Bot., Vol. xvii, Nos. 1, 2, 1893. 
