30 



drate. Plants larger than the Seligeriece, tufted. Usually 

 dioecious. 



101. Blindia. Peristome well-wolute or wanting. 

 Habit of Dicranella. 



Fam. 23. Grimmiacese. 



A. Capsule thin-walled, generally terminal ; lid soon 

 deciduous, not thick. 



1. Grimmiece. Lower leaf-cells rectangular or qua- 

 drate. Spores not large. 



a. Calyptra not plicate, mitriform or (sometimes in 

 Grimmia) cucullate. Leaves not (exc. Grimmia ccespiticia) 

 distinctly sulcate. Capsule exserted or (sometimes in 

 Grimmia) immersed. 



102. Grimmia. Peristome short; teeth often entire, 

 rarely rudimentary or wanting. Leaves often with hair- 

 point; cells (seldom all) sometimes with sinuous walls, 

 diversiform. Pedicel of the capsule generally not long, 

 sometimes curved. Stem mostly erect. 



103. Racomitrium.. Peristome long; teeth usually 

 partite. Leaves often with hairpoint; cells (mostly all, 

 exc. the alar ones) with sinuous walls, generally diversi- 

 form. Pedicel of the capsule straight, generally long. 

 Stem mostly decumbent or ascending. 



104. Campy lostelium. Peristome long ; teeth more or 

 less cleft, incurved when dry. Leaves without hairpoint; 

 cells rectangular with not sinuous walls. Pedicel of the 

 capsule often curved. Stem erect and simple. Habit of 

 Seligeria.. Plants very small. 



b. Calyptra plicate, mitriform. Leaves often sulcate ; 

 cell-walls not sinuous. Stem erect. 



105. Coscinodon. Capsule immersed. Leaves with 

 a long hairpoint, not crisped when dry. Dioecious or 

 monoecious. Habit of Grimmia pulvinata. 



106. Brachystelium. Capsule exserted. Leaves 

 without hairpoint, crisped when dry. Monoecious. Habit 

 of Orihotrichum (Ulota.) 



