—24— 



8— Lower leaf cells more or less porose ; capsules 



not strumose (except slightly so in D. pal- 

 lidum) 9 



Leaf cells not at all porose ; capsules strumose. 1 2 

 9 — Leaves entire or very faintly denticulate. . elongalum. 

 Leaves serrulate io 



10 — Leaves strongly falcate- secund ; upper leaf 



cells regular fuscescens. 



Leaves little or not at all secund ; upper leaf 

 cells very irregular. n 



11 — Costa at least i/6 width of leaf at the broadest 



point of the leaf. Plants 3-6 cm. high. . Miihlenbeckii. 

 Costa 1/10 width of leaf ; plants 2-3 cm. high. pallidum. 



12 — Leaves falcate-secund 13 



Leaves spreading sckisti. 



13 — Leaves with distinct angular cells ; capsule ob- 



long- cylindric Starkei. 



Leaves with few angular cells ; capsule short, 



obovate falcatum. 



14 — Costa ending in the serrulate apex; leaves 



curled wnen dry 15 



Costa excurrent; leaves scarcely altered by 

 drying (except D.fulvellum and D. ful- 

 vum) . 16 



1 5 — Apex of leaf papillose at back ; upper leaf cells 



rectangular montanum. 



Apex of leaf not papillose; upper leaf cells less 

 regular; plants commonly giving off nu- 

 merous axillary erect fiagellse bearing mi- 

 nute ecostate leaves flagellars 



16— Costa narrow, 1/5 to 1/4 width of leaf at base. 17 

 Costa broader, 1/3 to 1/2 width of leaf. . 18 



17 — Dioicous ; 3-4 cm. or more high Sauteri. 



Autoicous; 0.5-2 cm. high fulvellum. 



18 — Margin and costa of leaves entire ; apex usually 



broken viride. 



Margin and costa of leaves serrulate. . 19 



19 — Costa equalling 1/3 width of leaf at the base, 



or less ; leaves gradually narrowed to apex ; 

 all upper surface leaf cells rectangular. . fulvum. 

 Costa 1/3 width of base of leaf, or more; 

 leaves abruptly narrowed to a long slen- 

 der point ; all upper leaf cells greatly elon- 

 gated-linear longifolium. 



Look on the summit of your highest accessible hill or moun- 

 tain for the long-leaved Dicranum ( D. lo?igifolzu?n). It grows 

 on stone walls and exposed rocks. It is usually sterile, but is 

 easily recognized and distinguished from the fulvous Dicranum 



