TABLE OF CONTENTS 



PAGE 



I. INTRODUCTION 205 



11. MORPHOLOGICAL NOTES ON THE GENUS . 208 



1. Epidermis and Epidermal Pores . . . 210 



2. Compact Ventral Tissue .... 217 



3. Ventral Scales . . . ... . 218 



4. Rhizoids 221 



5. Receptacles 221 



6. Sporophyte 22y 



7. CuPULEs . • 228 



III. DESCRIPTION OF SPECIES 



Section I. Astromarchantia 



1. M. polymorpha L. . . . 



2. M. plicata Nees & Mont. . 



3. M. Berteroana Lehm. & Lindenb. 



229 



232 



232 

 241 

 246 



Section II. Chlamidium . . . . . 253 



M. paleacea Bertol 253 



M. breviloba Evans . . . . . 265 



M. domingensis Lehm. & Lindenb. . . 269 



M. papillata Raddi 280 



M. Bescherellei Steph 287 



M. chenopoda L. . • • • • 290 



Doubtful Species 



312 



