1892.] 



LEJEUNEÆ MADAGASCARIENSES. 



7 



not rare in certain Frullanuc, notably in my Frullania squamu- 

 ligera. In the periinth of Lejeanea &c, there is always an an- 

 tical suture present, which may or may not be elevated into a 

 keel, or even a crest according to the species. In Ceratolejeunea 

 the normal 4 horns sometimes become 5, and botn forms may 

 occasionally be seen on the same plant. An essential difference 

 is usually whether there be 2 postical keels or only 1, although 

 even that difference fades away in certain Prionolejeunea. My 

 Lopholejeunea liarpaphylla has a solitary postical keel, hence I 

 proposed, if I could make out any additional species with the 

 same peculiarity, to elevate into a distinct subgenus Callistole- 

 jeunea, as I told Stephani 5 years ago." 



Description of plate II. Fig. 1. Plants nat. size. 2. Portion 

 of stem, postical view X 31. 3—6. Leaves X 31. 7. Cross- 

 section of lobule X 85. 8. Portion of leaf X 290. 9—11. Under- 

 leaves X 31. 12. Bracts X 81. 13. Bracteole X 31. 14. Pe- 

 rianth X 24. 15. Cross-section of perianth X 24. 16. Portion 

 of the wing of perianth X 31. 17, 18. Scales growing on the 

 perianth X 85. 



10. Lejeuuea Madngascariensis Gotts „Rel. Rut.,, 



Schizostipæ. 



11. Prionolejeunea Rutenbergii (Gotts.) Spruce, Gotts. „Rel. 

 Rut.". 



12. Prionolejeunea grata (Gotts.) Spruce, Gotts." „Rel. Rut.". 



13. Harpalejeunea solitaria (Gotts.) Spruce, G. „Rel. Rut.". 



14. Strepsilejeunea brevifissa (Gotts ) Spruce, Gotts. „Rel. Rut.". 

 In montibus Ankaratra, legit M. Borgen, 1877, (1 K.) 



15. Strepsilejeunea cardiophylla (Gotts.) Spruce, Gotts. „Rel. 

 Rut.". 



