s.A. iiin iH'in 'J A. y)i) 



5- Siihiiirrard . cillirr rcf/iilarly ar frc(jucutl\' : 



J'issidciis. Hryum. .liiviira. 



Cononiitriitm, Amblystcci'nim. Diiiiiorlicra. 



Hyophila. W'ardia. Marchaiitia. 



Milium. J'^iclla. Possoiiibrotiic. 



Etc. 



E. As l^pipjn TKS ON Tree Stems. — Althongli a very large 

 |>roiK>rtion of the Rryophyta (frequently (K'cur as epiphytes 

 on tree stems, many of these are rather sticcrssioii /slants folloAV- 

 i'lig nj) and taking advantage of the pioneer work done by a 

 small number oif s])ecies. Among the ])ioneers are: — 



Macromiiyium. BracliYiiiriiiiiin. h'niUaiiia, 



fabrunia. Tortula. Madnilicca. 



Rhaphidostciiium. Barbiila. Radiila. 



Orthotrichuih. ]\liacot'ilnn\. /'lof/iocliila. 



Other e})iphytes succeeding or accompanying these will lie 

 mentioned under the Qiniax Types. 



F. OiN Walls, Stones. Cement Work, Ivn . — This is the 

 favourite haunt of these genera : 



Tortula. Hryuiii. .Stcrcodoii. 



ToricUa. Hrachyinciiiuui. Rliyncliostef/iinii. 



Barhitla. Barfraiiiia. Brack ythcr'ni in. 



Wcisia. Macrotititriiiin. Etc- 



Many other (jcncra api)ear after humus has been formed 

 by these, if the walls remain moderately damp. If very dry no 

 Bryophyta aj q lear. 



II. Cli.\l\x Tvi'ES. — While almost all the Bryoi>hyta nia\ 

 be pioneers on occasion some are also able to establish them- 

 selves as relatively permanent inhabitants, and thus remain as 

 long as favourable conditions continue. Notable among these 

 are : 



1. Xeroi'Uvtic AssocL'\tions. — These are fit to endure per- 

 manently the arid conditions of the Western and Midland 

 Region, or of the fully exposed localities in the Eastern RegioiL 

 and in the Northern Region. These conditions seldom become 

 moister. and often become drier ; still, the species forming these 

 associations survive, or contimte to appear. 



These associations include all the species already mentioned 

 ajs belonging to the W'estern and Midland Region, and in the 

 Ea.stern and Northern Regions it includes species of : 



JVeisia. Fissidcns. Riccia. 



Hyinenostoiintin. Pfyrfwinitrinin. Fimbriaria. 



Trkhostoinitm. Brachythcciuin. Kanfla. 



Cainpyhpus, Rhynchosict/iuni. 



2. MESoimvTic AssocL\TioNs. — Between the xerophyiic 

 tvpe and the hygrophilous type comes the mesophytic type. 



