ARCHIDIUM. 53 



3. Cynodontiese. Leaves chlorophyllose, often rather 

 broadly lanceolate, usually papillose, without distinct angular 

 cells, the upper minute, quadrate. Capsule on a long seta, oblong 

 or oblong-cylindrical, usually inclined, frequently strumose, and 

 mostly striate. Peristome variable. 



4. Trematodonteas. Stems short. Leaves lanceolate- 

 subulate, without distinct angular cells. Capsule with a long in- 

 flated neck, which is sometimes longer than the capsule itself ; 

 cleistocarpous in the continental genus Bruchia ; in Trematodon, 

 the only British genus, peristomate, with 16 lanceolate, perforated 

 or cleft teeth ; cernuous. 



5. Dicranellese. Plants small, scarcely branched. Leaves 

 smooth, lanceolate-subulate, without special angular cells. 

 Capsule short, erect or inclined, frequently striate ; lid rostellate 

 or subulate-rostrate ; peristome dicranoid, of 16 cleft teeth, wider 

 at base. 



6. Dicraneae. Plants usually tall, branched. Leaves 

 narrowly lanceolate, often falcato-secund ; cells at angles en- 

 larged, often inflated, hyaline or coloured. Peristome variable. 

 Lid almost always longly subulate. 



7. Leucobryeae. Plants whitish, the leaves almost without 

 chlorophyll, almost entirely composed of the nerve ; internal walls 

 of the cells porose. Capsule as in Dicranum ; peristome of 8 or 

 16 teeth, dicranoid. 



Tribe 1. Ditricheae. 



9. ARCHIDIUM Brid. 



Plants small, branched by innovations below the apex. 

 Leaves ovate-lanceolate, areolation hexagono-rhomboid. Capsule 

 sessile, spherical, cleistocarpous, formed of a single layer of cells 

 without columella or true spore-sac, the spores being produced 

 from a single basal cell, the contents of which by repeated division 

 form about 16 large, smooth spores. Calyptra very thin, saccate, 

 tearing irregularly. 



1. Archidium alternifolium Schp. {Phascum alter nifolium 

 Dicks., A. phascoides Brid.) (Tab. XII. D.) 



Plants minute, in dull green patches, stellately branched, the 

 innovations formed below the apical inflorescence, elongated and 

 finally prostrate, with small-leaved ramuli. Leaves distant, 



