MOSSES WITH A HAND-LENS lOQ 



P. AsAGRAYANA Mont. is another common species somewhat 

 resembling the preceding, but larger and usually growing on 

 rocks, occasionally on trees. The lobule is much more elongated 

 and there is a line of discolored cells in the middle of the leaf that 

 reminds one of a costa. 



The lobule in FruUania is usually modified into a saclike 

 body of various shapes which serves for the temporary retention 

 of water. This saclike form of the lobule is scarcely apparent 

 with a lens, but under the compound microscope becomes a 

 beautiful and interesting object. 



There are several other species found within our range, but 

 the compound microscope is needed for their determination. 



JuBULA HuTCHinsiaE is a plant likely to be confused with 

 FruUania. It grows on wet rocks, especially in mountains. It is 

 easily differentiated by its strongly lacerate-dentate leaves. 



PORELLA. 



The Porellas dififer from the Frullanias in their larger size, 

 lighter color, larger and entire underleaves, and lobules not sac- 

 like, but Ungulate to oblong. The lobules are plainly attached 

 by the narrow end to the lobe and extend forward parallel 

 with the stem. 



Fig. 95- 



Fig 96. 



Figure 95. Porella platyphylla. From Bryologist, 5: 35, 1902. 

 B. Upper side of stem showing perianth and emerging capsule. 

 Also showing clearly incubous arrangement of leaves. C, Underside of 

 stem, the leaves shown too far apart. D. Longitudinal section of peri- 

 anth. E. Capsule. F. Leaf. G. Part of plant showing male 

 branches. 



Figure 96. Porella pinnata. From the Bryologist, 5: 34, 1902. 

 A. Underside of stem showing narrow underleaves and narrow lobules at- 

 tached by their shorter edge to lobe. B. Single leaf showing lobe and 

 lobule. 



