56 HANDBOOK OF BRITISH MOSSES. 



stome of sixteen lanceolate externally trabeculate bi-trifid 

 teeth, rarely wanting; columella not deciduous; lower leaf- 

 cells larger and diaphanous. 



Genus 76. Schistidium.— Columella adhering to the lid, and 

 falling away with it. 



Obdeb XXV. REBWIGIACEI. 



Sporangium globose or oblong, immersed, or slightly ex- 

 serted ; peristome none ; leaves nerveless. 



Genus 77. Hedwigidium. Sporangium more or less ex- 

 serted ; veil cucullate, smooth. 



Genus 78. Hedwigia. — Sporangium immersed ; veil conical; 

 leaves diaphanous ahove. 



Obdeb XXVI. ENGALYPTEI. 



Sporangium straight, even, or striate ; veil very large, cylin- 

 drico-campanulate. 



Genus 79. Encalypta. — Fruitstalk elongated; veil mostly 

 appendiculate ; vaginula crowned with a conical spongy mass. 



Obdeb XXVII. BIPABIACEI. 



Peristome of thirty-two teeth, connected together hy anas- 

 tomosing process, or an irregularly* fissured or rudimentary 

 membrane ; top of columella connected with the peristome. 



Genus 80. Cinclidotus. — Veil smooth, conical, split on one 

 side ; peristome simple, sometimes rudimentary, of thirty-two 

 teeth, rising from a common membranous base, twisted above 

 round the columella. 



Obdeb XXVIII. TBIOROSTOMEI. 



Veil cucullate,' peristome of thirty-two filiform teeth, distinct 

 or united below, frequently in pairs, and sometimes twisted. 



