REVUE BRYOLOGIQUE “: 89. 
aduncus Warnst.). — The very polymorphous forms included 
under this name, which are divided into several distinct species 
by Herr. Warnstorf, are well represented in this district. In one 
pond near Walton Junction from which clay had been taken for 
brickmaking, the forms of group. Kneiffii were formerly abun- 
dant, including var. intermedium Schimp with f. penna Sanio and 
‘f. laæifolia Ren. This pond varied considerably in area and depth 
from season to season, once only in about 10 years becoming 
actually dry. It was very unequal in depth in various parts, and 
on one side there was marshy ground. Yet under none of the 
conditions presented did any forms referable to groups typicum 
or pseudofluitans appear. There was a minimum amount of lime 
in the soil, the dominant plant being Alisma Plantago, and the 
mosses of the banks surrounding the pond: Wicranella varia, 
Tortula aloides, Catharinea undulata and Æurynchium confertum. 
About a mile away is a second pond, which probably contains a 
slightly larger amount of lime, enough to form a thick calcareous 
deposit on the Chara vulgaris growing in it. The dominant plants 
are Sparganium neglectum and Juncus glaucus, with a little 
Mentha hirsuta and Epilobium hirsutum. Here the principal forms 
of H. aduncum are the var. paternum Sanio and its forma gracilis 
Ren. In one part a few patches of the var. intermedium Schimp. 
can be found, but it dæs not spread. In summer the pond gene- 
rally degenerates into a mere marsh, sometimes becoming almost 
dry. No examples of Z. aduncum, group typicum have appeared- 
__ Despite the very varying edaphic conditions, the Harpidia here 
. have been little affected except in size and general luxuriance. 
The group characters for many years have persisted without 
change. 
Near Burscough in some low lying marshy ground, the var. 
_intermedium Schimp. occurs, with var. allenuatum Boul. These 
are accompanied by Aypnum polyganum, Hypnum Sendineri, 
and a large aquatic form of Fissidens adiantoides.. À similar asso- 
ciation of forms oceurs near Rainford, but no examples of Zypnum 
aduncum, groups pseudofluitans or typicum, have been seen in 
either locality. ce 
On the coast sand dunes, there is probably a much larger pro- 
portion of lime in the soil, than in that of any of the localities 
cited above, The water in the pools also gives a more decided 
_ reaction with Ag N°3, but is very far from being brackish. A 
certain amount of chlorides reaches them from the sea, conveyed 
in spray during strong winds. The general flora is rich and 
varied presenting in addition to many ordinary species, members 
