m u s c i. 23 



cellules in the lower part not curved : and the teeth of its peristome 

 are in pairs. 



Plate 5, B. — Macromitrium Tongense : fertile plants. Fig. 1. 

 Portion of fertile plant. 2, 3, 4, 5, 6. Leaves. 7, 8. Portions of a 

 leaf, showing the reticulation. 9, 10, 11. Cross sections of leaf. 12. 

 Deoperculated capsule, with pedicel, perichsetial leaves, and paraphyses. 

 13. Capsule, with operculum. 14. Same, without operculum. 15. 

 Capsule, covered by calyptra. 16. Calyptra. 17. Cross section of 

 same. 18. Hairs of the calyptra. 19. Three teeth of peristome, with 

 portion of capsule wall. 20, 21. Pericheetial leaves. — Details magni- 

 fied. 



3. Macromitrium piliferum, Schwcegr. 



Macromitrium piliferum, Schwsegr. Suppl. 2, 2, p. 66, t. 172. 



Hab. Kaala Mountains, Oahu; Mauna Loa, Hawaii; Sandwich 

 Islands. 



4. Macromitrium gracile, Hooh. 



Orihotrichum gracile, Hook. Muse. Exot. t. 27. 

 Macromitrium gracile, Schwaegr. Suppl. 2, 2, p. 39, t. 112. 



Hab. New Zealand. 



5. Macromitrium subtile, Sc7iwceg?\ 



Macromitrium suhtile, Schwasgr. Suppl. 2, 2, p. 140, t. 192. 



Hab. Mountains of Tahiti, Society Islands. Savaii, one of the 

 Navigator's Islands. 



Appears to be common in Tahiti : the peristome very fugacious : 

 inflorescence monoicous. 



