﻿1903] MACCHIE OF NEAPOLITAN COAST REGION 423 



Perhaps it would not be easy to sum up the characteristics of 

 the histology of the leaves of most of the species which consti- 

 tute the macchie better than by referring to a paper by W. Rus- 

 sell,5 He has made a careful comparison of the structure, 

 especially of the stems and foliage, of fifty-eight species of 

 plants, taking specimens of each from the neighborhood of Paris 

 and also from Carnoules, on the French Mediterranean coast. 

 Working out the histology of these, with reference to the influ- 

 I ence of the Mediterranean climate on structure, he has (among 



other differences) established the following regards in which 

 the southern differ from the northern forms: Epidermis with 

 larger and higher cells, with more regular contours and thicker 

 walls; more intense lio^nification ; increase of volume of wood 



I 



and of bast; increase of thickness of leaves. 



M 



and more northerly individuals of the same species are similar 

 to those which distinguish the Mediterranean from^more north- 

 erly species of the same genus. This is well shown by compar- 

 ing, for instance, the Neapolitan species of Smilax, Qucrcus, 

 Rhamnus, Rnbus, Rosa, and Viburnum with those of northern 

 Europe or the northern United States. 



Naples, Italy. 



BIBLIOGRAPHY, 



Alvino e Quaranta, Notizie della Storia Naturale dell' Isola di Capri. 



Napoli. 1836. 

 Baccarixi, p., Studio comparativo sulla flora Vesuviana ed Etnea. Xuov- 



Giorn. Bot. Ital. i88i,p. 150. 



I caratteri e la storia della Flora Mediterranea. Catania. 1899. 

 Balsamo, F., Cenno geologico e botanico sull' Isola d'Ischia. Giornale 



r Ateneo Galileo Galilei. Napoli. 1883, 

 Baselice, L.. Botaniche peregrinazioni neir agro Biccarese. Campobasso. 



1842. 

 Beck von Mannagetta, Guxther, Die Vegetationsverhaltnisse der illyri- 



schen Lander (in Engler's & Drude's Vegetation der Erde. Leipzig: 



Engelmann. 1901. 

 Beguinot, Augusto, Notizie preliminari sulla flora dell' archipelago Pon- 



ziano. Boll, della Soc. Botanica Ital. Firenze. 1900, p. 290. 



5 Influence du climat Mediterranean. Ann. Sci, Nat. Bot. VIII. i. 1895. 



