1076 Stephens. — Development of the HaiLstorium of Striga lutea. 
5 . Fraysse, A. : Contribution a la biologie des plantes phan6rogames parasites. Montpellier : 
Societe Anonyme de l’Imprimerie Generale du Midi, Serie A, No. 515, 1906. 
6. Fuller, C. : First Report of the Government Entomologist, Natal, 1899-1900, pp. 20-22, PI. V. 
7 . Goebel, K. : The Organography of Plants. (English Translation.) Oxford, 1900. 
8. Peirce, George J. : The Dissemination and Germination of Arceuthobium occidentale , Eng. 
Ann. Bot., vol. xix, 1905, pp. 99-113, PI. Ill and IV. 
EXPLANATION OF PLATE XCIII. 
Illustrating Miss Stephens’s paper on the Haustorium of Striga lutea. 
c. = cortex ; n. = ‘ nucleus ’ ; a.s.t. = axial strand of tracheides ; f. — line of ferment secreted 
by the haustorium, with the disorganized tissues of the host dissolved in it. 
Fig. 1. Optical median longitudinal section of root of S. lutea running alongside root of maize. 
Four haustoria have penetrated the maize root, x 23. 
Fig. 2. Optical median longitudinal section of cortex of a root of S. lutea t showing three cells 
of the hypodermal layer elongating ; these will give rise to a haustorium. x 140. 
Fig. 3. Optical median longitudinal section of portion of root of S. lutea , showing a young 
haustorium originating from cells of the subhypodermal layer, x 140. 
Fig. 4. Optical median longitudinal section of root of S. lutea , showing a later stage in the 
development of the haustorium. x 140. 
Fig. 5. Optical median longitudinal section of a haustorium of S. lutea which has penetrated 
as far as the endodermis of a root of maize. Only such of the cells of cortex and nucleus are drawn 
in, as could be seen with distinctness at the focus of the section, x 140. 
Fig. 6. Transverse section of a haustorium of S. lutea which has penetrated into the stele of 
a root of the maize, x 280. 
Fig. 7. Portion of Fig. 6 enlarged, showing penetration of papillae of haustorium into vessels 
of the maize stele, x 760. 
Fig. 8. Longitudinal section of a single cell of the endodermis of the maize, showing papillae 
of the haustorium secreting ferment which has swollen and dissolved the inner wall of the cell till 
only its inner limit is perceptible. The outer wall has also begun to swell, x 1100. 
