54 MUSCI 



SYNOPSIS OF FAMILIES. 



Order I. SPHAGNALES. 



(Plate 6, A.) Gen. i. i. Sphagnaceae 



Order II. ANDREAEALES. 



(Plate 6, B.) Gen. i. i. Andreaeaceae 



Order 111. BRYALES. 

 I. Subord. Eukkyineak. 

 Series i. Haplol epi d eae. 



A. Seta absent. The sessile capsule not opening by a lid, but breaking 



irregularly or merely decaying. Calyptra finally splitting in an 



irregular way, leaving some portions at the base of the capsule. 

 Spores very large. (Plate 6, C.) 



Gen. 3. 3. Archidiaceae 



B. Seta present. Calyptra borne on the apex of the capsule. 



a. Leaves distichous, amplexicaul, with dorsal wings. (Plate 6, E.) 



Gen. 4. 4. Fissidentaceae 



b. Leaves pluriseriate, without dorsal wings. 



I. Plants whitish. Midrib of leaves broad, consisting of several layers 



of large, empty cells and one inner layer of smaller, green cells. 



Gen. 5. 5. Leucobryaceae 



II. Plants green. Cells of midrib of leaves all with chlorophyll. 



1. Teeth of peristome split into two (rarely 3) segments. 



x Cells of leaves smooth. (Plate 6, D.) 



Gen. 6 — 16. 6. Dicranaceae 



x x Cells papillose. (Plate 6, G.) 



Gen. 17 — 29. 7. Pottiaceae 



2. Teeth of peristome mostly entire. 



x Leaves vaginate; inner cells of vagina delicate ana 1 empty. (Plate 6, F.) 

 Gen. 30. S. Calymperaceae 



x x Leaves not vaginate ; inner cells of the basal portion similar to the 

 others. (Plate 6, H.) 



Gen. 31 — 33. 9. Grimmiaceae 



Series 2. Diplolepideae. 

 A. Capsule usually terminal on the main axis or its principal branches. 

 a. Leaves distichous. 



Gen. 34. 10. Eustichiaceae 



