486 BOTANICAL GAZETTE * [june 



standing water. 



moss 



in 



• 



ground, on sticks, or on logs. Calliergon cordijolium y the two 

 species of Campylium, the Brachythecium, and Drepanocladus 

 aduncus continue, often on partly submerged sticks. In slightly 

 higher situations, but on ground that is still very wet, are 

 Leucobryum glaucum, Climacium americanum, and Thuidium 

 delicatulum. With the exception of Leucobryum, these species 

 are also found on logs and sticks. Anomodon rostratus comes 

 in where there is less moisture, particularly about tree bases. 

 Here, as in the other mesophytic moss habitats, the soft hygro- 

 scopic mass of moss tissue forms a favorable place for the ger- 



mination 



As one 



inmg 



moss growth becomes less in 



very much in species until the dune itself is reached. 



In the Hillside bog, a large part of which has reached the 



in which there is much less water than at Mineral 



Sph 



In 



dominant vegetation. It must have reached a very luxuri 

 development in the recent past, but is now on the decline, 

 many places Aulacomnium palustre forms a second moss stage 

 growing on Sphagnum, and this is frequently accompanied by 

 ' Poly trie hum commune. Cooper describes such an association in 



Sphag 



The bog itself has not yet 



moisture 



much bevond the bos: at M ineral 



m 



that this will be the fate of the bog if left to nature's influence. 

 In the adjoining beech-maple forest Catharinea undulata is again 

 the only moss of any prominence. 



Table II represents the hydrarch succession from open water 

 of lagoons and ponds to the climax forest. Once more the great 

 importance of pioneer mosses in the advancement of the higher 

 plant associations is shown. The economic value of shallow 

 ponds is slight ; while on the other hand they may be very injurious 

 in that they harbor larvae of insects, harmful to man, so that the 



