242 
the host is killed for a short distance, the cortex ngage locally 
withered and separated from the stele. In most of the cases 
examined the haustorium was still attached to living portions of the 
root on one or both sides of the dead part, so that parasitic nutrition 
could stili be maintained. 
The structure of the haustorium is shown diagrammatically in 
Fig. 2. The so-called nucleus of the haustorium has a central 
portion (b.) composed of numerous short tracheides mixed with 
parenchymatons cells. This is surrounded laterally by a zone of 
differentiated parenchymatous a ({a.) apparently repr ae 
oem. ‘The greater part of this and of the central mass of shor 
tracheides has been derived ge a cambium lying between oe 
two tissues. The central group of tracheides is connected with the 
stele of the parasite (s.) on one side, and with that of the host on 
the other by means of straggling tracheides, ee by lines in 
the diagram. The type of structure is similar to that of the 
haustorium of Exocar pus cupressiformis* and aie root-parasites. 
L. A. B. 
List of Gold Coast Trees and Shrubs.}—The list is intended to 
assist Forest 4 cog in the bush. The sources of Mr. Chipp’s 
information a wn collections and observations on the spot, 
and the rich lied ‘of Gold Coast plants preserved in the Kew 
Herbarium 
The preface coma 8 short history of botanical Moiese aa in 
included, _ ~~ an index to the botanical names quoted in the 
body of the 
Mr. Chi ‘pp’ 8 ae is an excellent beginning in a systematic study 
of the flora of the Colony. The book is well and clearly printed, 
and neatly bound in stiff canvas covers, the solution used in binding 
having been “essa prepared in order to render it impervious to 
the ravages of i 
Hada pesnlies. pas been adopted the book would have been more 
convenient for carrying in the pocket. 
pe ee 
* Benson, Root Parasitism in Exocarpus. Ann. Bot., vol. 24, p. 670, Text- 
Pars Gold Coast. London. Wane and Sons, Lid., 1913. 8v0. . 59. 
- < List of Trees, Shrubs pot Climbers of the Gold Coast, Ashanti and the 3 
erritories, by T. F. Chipp, B. r of 
