16 A MANUAL OF MOSSES 



64. Leaves almost microscopic, color- 

 less; capsule exserted on a thick, 



red stalk Bu.vbaumia, p. 182 



B. PLBUROCARPI 



65. Leaves distichous, dorsally winged and 



clasping at the base Plssidens, p. 79 



65. Leaves pluri-seriate 66 



66. Cilia none; segments none or rudi- 

 mentary, or filiform and not split. 



67 



66. Cilia often present; segments cari- 

 nate and often split along the me- 

 dian line 76 



67. Segments quite rudimentary, sometimes 

 with a distinct carinate basal membrane; 



leaves more or less papillose 68 



67. Leaves smooth 69 



68. Leaves deltoid to round-ovate, 

 spinulose-dentate to hmbriate; 

 paraphyllia none; costa single and 

 usually half the length of the leaf. Thelia, p. 238 

 68. Leaves spatulate to obovate, entire 

 or cristate-serrate; costa double or 



short or almost lacking Pterygynandnun, p. 232 



69. Inner peristome lattice-like; leaf-cells 



narrow and prosenchymatous 70 



69. Inner peristome not lattice-like, some- 

 times none; segments when present free, 



sometimes rudimentary 71 



70. Ecostate; capsule immersed; plants 



aquatic Fontinalis, p. 203 



70. Costate; capsule more or less ex- 

 serted; plants growing on the base 



of bushes and shrubs Dichelyma, p. 208 



71. Leaves complanate, transversely undu- 

 late Ncckcra, p. 218 



71. Leaves more or less spreading, not trans- 

 versely undulate 72 



72. Inner peristome none, or, if pres- 

 ent, the linear segments without a 

 basal membrane; teeth flat, thin, 

 distantly articulated, approximate 

 in pairs; costa simple, often delicate 



and short, or none 73 



72. Inner peristome lacking or the 

 peristome double; basal membrane 



low 74 



73. Costa mostly delicate and short; teeth 

 broad and obtuse; leaves serrate to cili- 



ate-dentate Fabronla, p. 234 



73. Costa strong, ending above the middle 

 of the leaf; peristome deeply inserted; 

 teeth broadly lanceolate; segments 

 shorter than the teeth, linear, almost 



smooth Anacamptodon, p. 235 



74. Calyptra cucullate; capsule ex- 

 serted; inner peristome without 

 segments 75 



