﻿R—AYTONIA 



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EXPLANATION OF PLATES I-IV 

 Fig. i. —Sketch of monoecious thallus, dorsal view. 

 Fig. 2.— Sketch of thallus, ventral view. 

 Fig. 3. — Sketch of ventral scales with appendages. 

 Fig. 4.— Sketch of rhizoids; X47°- 



^Fig. 5.— Longitudinal section of an old rhizoid with a new one developing 



Fig. 6— Section of compact tissue by the thallus with fungal hyphae 

 passing through the walls and destroying the protoplasm; X45°- 

 Fig. 7.— Fungal hyphae entering a thallus through a rhizoid. 

 Fig. 8.— Surface view of a pitted cell; X687. 



Fig. 9.— Vertical longitudinal section of a thallus through the apical cell, 

 showing the origin of ventral scales (s) and air chambers (o and b) ; X37S- 



