EXPLANATION OF THE PLATES. 125 



Plate XVII. {continued) and XVIII. 



ORTHOTRICHEiB. 



Fig. 5. Characteristics of Order. 



Capsule («) immersed , or on a short seta, very long, cylindrical or pear- 

 shaped, swelling at the base (apophysis) , long, with eight or sixteen coloured ribs 

 (stride), which alternate with the teeth, and make the capsule appear deeply 

 furrowed ; calyptra {!:>) large, and beset with upright bristles (whence the name 

 Bristle Moss) ; peristome (c) single or double, below the mouth of capsule, its 

 thirty-two divisions apparently forming' eight or sixteen teeth ; inner peristome, 

 when present, consisting of eight or sixteen cilia. Small plants, stems much 

 branched, growing in round cushions on trees and rocks ; the leaves remarkably 

 crisped when dry. 



I. Capsule immersed, calyptra with sixteen f urrows. 

 Fig. 6. Orthotrichum cupulatum. 

 Sessile-fruited Bristle Moss (a) . 



Colour. Dark green. 



Stems. Branched, half- inch long. 



Leaves. Lanceolate, keeled, spreading ; nerve large. 



Flowers and Fruit. As in all the species, the capsule comes to maturity in twelve 

 months after its first formation. Capsule immersed] lid short; calyptra 

 light coloured. Summer. 



Locality. On limestone rocks and walls. 



Variety (Fig. 7) . 0. nudum. — Larger, leaves coarsely toothed at the apex; 

 appearing above the leaves (exserted) ; calyptra without hairs. 



Fig. 8. Orthotrichum anomalum. 

 Anomalous Bristle Moss (a) . 



Colour. Dark green. 



Stems. Branched, branches few. 



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