112 



MOSSES WITH A HAND-LENS 



and are very large, much curved, 

 and are borne on long stout setae. 

 The perichaetial leaves bear long 

 cilia along their upper margins. 

 This is one of the characters by 

 which this species can be dis- 

 tinguished readily from another 

 closely related species, T. recog- 

 nition. 



T. RECOGNITUM (Hedw.) 

 Lindb. will not be distinguished 

 from the Common Fern Moss ex- 

 cept by close scrutiny. The peri- 

 chaetial leaves are not ciliate and 

 the stem leaves when moist are 

 spreading-recurved instead of 

 erect-spreading, as in the Com- 

 mon Fern Moss. The shape 

 of the stem leaves is also dif- 

 ferent ; the figures explain these 

 differences better than any de- 

 scription. Both species grow on the ground, stones, or rotten 

 wood, but this matures its spores in July, the other in early 

 winter. 



FIGURE 50. a, Thuidium deli- 

 catulum X i. b, T. scitum X i. 

 c, Capsule of the same X 5- T. 

 abietinum X i. 



FIGURE 51. Portion of stem and leaves of Thuidium recognitum, at the 

 left. Same of T. delicatulum, at the right. 



Growing on the bark of trees are several smaller species that 

 are usually only once pinnate. 



