Bartram's Moss 



base forming extensive tufts on soil and rock, or occasionally on 

 trees. 



The leaves are long and narrow, opaque and yellowish-green; 

 with a round vein which vanishes in the serrated apex or passes 

 beyond to form a rough point. 



The spherical spore-cases marked with parallel ridges are 

 erect, or nodding, on long erect pedicels. The lids are small, 

 convex or obtusely pointed. 



Teeth are rarely absent or simple, usually double, the outer 

 attached to basilar membrane. There is no annulus. 



The genus contains one hundred and three species in all, thir- 

 teen of them being known in North America. The name was 

 given by J. G. Hedwig in hon- 

 our of John Bartram, one of 

 the earliest American botanists. 



The Apple-moss, Bartra- 

 mia pomiformis, Hedw. See 

 cut on page 216. 



Habit and habitat. In soft 

 bright or yellow-green tufts 

 on shady banks and in clefts 

 of rocks. 



Name. From the Latin po- 

 mum, apple, and forma, form, 

 referring to the spore-cases. 



Plant (gametophyte). 

 Stems i to 3 inches high with 

 densely felted hairs below. 



Leaves. Long, open, and 

 somewhat twisted when 

 moist, more erect and crisped 

 when dry. Narrowly linear 

 and awl-like from a paler base; 

 vein extending beyond the 

 apex to form a spiny awn; 

 margin sharply serrate above, 

 rolled back from the middle 

 downward. 



Habit of flowering. Male and female flowers on the same 

 plant (monoicous). 



B. pomiformis. Plant stripped of leaves 

 toshowantheridia, archegonia, and paraphy- 

 ses on the left branch; the base of an old 

 pedicel lies between the two branches. 



215 



