i 9 i6] STARR— AYTONIA 57 



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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; X470. 



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

 within. 



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

 passing through the walls and destroying the protoplasm; X450. 



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 (a and b); X375. 



