64 SYMBIOSIS— DISJUNCTIVE 



inhabiting a hole in a tree and would be classed as social disjunctive 

 symbiosis. 



Nepenthes is a genus of climbing or epiphytic plants of tropical 

 Asia. The pitchers at the ends of the leaves of these plants have 

 nectar glands just within the rim which serve to attract insects. 

 The inner surface is extremely smooth and the insects in getting at 

 the nectar usually slip and fall into the liquid below. The liquid in 

 these pitchers has been shown to contain protein-digesting enzymes. 



Dischidia, an epiphytic pitcher plant of the Malayan region, has 

 two pitchers, one within the other. Soil and water collect in the 

 outer pitcher and it thus serves as a sort of living flower-pot into 

 which adventitious roots from other parts of the plant grow. The 

 symbiotic relations of Dischidia have not been very thoroughly 

 studied but they probably are similar to those of other pitcher 

 plants. 



REFERENCES 



Bailey, I. W.: Some Relations Between Ants and Fungi, Ecology, 1, 174- 



189, 3 PL, 1920. 

 Bequaert, J.: Ants in Their Diverse Relations to the Plant World, Bull. Am. 



Mus. Nat. Hist., 45, 333-583, 1922. 

 Bosb, S. R.: The Fungi Cultivated by Termites of Burkunda, Chilka Lake, 



India, Rec. Indian Mus., 25, 253-258, 1923. 

 BuLLER, A. H. R.: The Red Squirrel of North America as a Mycophagist, 



Trans. British Mycol. Soc, 5, 355-362, 1920. 



Slugs as Mycophagists, Trans. British Mycol. Soc, 7, 270-293, 1922. 



Darwin, Charles: Insectivorous Plants, New York, D. Appleton & Co., 1895. 

 Hegner, Robert: Big Fleas Have Little Fleas, Baltimore, The Williams & 



Wilkins Company, pp. 111-115, 1938. 

 Hegner, R. W. : The Interrelations of Protozoa and the Utricles of Utricularia, 



Biol. Bull. Marine Biol. Lab., 50, 239-270, 1926. 

 Howard, A.: The Effect of Grass on Trees, Proc. Roy. Soc. London, B97, 



284-321, 1925. 

 McDotJGALL, W. B. : The Classification of Symbiotic Phenomena, Plant World, 



21, 250-256, 1918. 

 Svmbiosis in a Deciduous Forest, Bot. Gaz., 73. 200-212, 1922; 79, 



95-102, 1925. 



