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much of the material known in Europe as A. hygrophilum (Jur.) Schimp. 
A. hygrophilum of Limprich’s Bry. Siles. No. 345 in Herb. Columbia Univ. 
—Hypnum Bergenense without a doubt, but Husnot’s Muse. Gall. No. 939 in 
my collection, issued as A. hygrophilum is not H. Bergenense at all but what 
several American and European authors have termed A. Kochii. This 
species is not at all the Hypnum radicale of the L. & J. Manual, that is a 
form of varium. In my opinion Hypnum Bergenense is a Campy lium, 
as it was in the opinion of Austin, and Limpricht’s No. 345 was issued as a 
Campy lium. Austin’s specimens are labelled as a var. of C. chry sophy llum 
and the stem leaves are much like those of that species, broadly cordate- 
ovate and abruptly and longly acuminate, decurrent and subclasping at base 
so that the leaf will not lie fiat at base , when removed and mounted. Tbe 
alar cells are thin-walled , hyaline and conspicuously broader than those 
above. The leaves are also entire, costate to middle with median leaf cells 
6-10: 1, thin- walled and less chlorophyllose as a rule than in most Ambly- 
stegia. It differs from Campy lium chry sophy llum in the much more distant 
leaves, little branched stems, more lax general habit and resemblance to the 
Amblystegia in appearance. A. Kochii while associated with A. riparium 
by Brotherus is apparently often confused with Campy limn radicale. Its 
leaves spread directly from the flat base and are flat throughout with shorter 
leaf cells having thicker walls. 
A. serpens a comparatively well known and understood species grades 
into A. Juratzkanum, which appears to me at most merely a robust variety of 
serpens with larger, more spreading leaves having a less distinctly marked 
area of quadrate alar cells. The alar cells are more likely to be all longer 
than broad than in serpens , but this distinction does not always hold and I 
am inclined to think it a matter of habitat for I have found leaves with. the 
alar cells of A. serpens on one side and A. Juratzkanum on the other. 
There is a western moss with the size of A. Juratzkamim and alar cells 
of A. serpens , having the leaves proportionately broader and more shortly 
acuminate than in serpens. This I have not found described. It appears to be 
common in the Rocky Mountains, and until further light is shed on the problem 
I propose the name A. serpens var. giganteum var. nov. for it. Were it not for 
its peculiarly distinct quadrate alar cells it might be put with forms of Kochii 
into which Juratzkanum seems to me to grade. Kochii being distinguished 
by its larger size, laxer basal areolation and larger cells. Cheney speaks of 
A , Kochii as not common, but the form I have referred to A. Kochii is 
abundant in the East. Amblystegium Kochii is distinguished from small 
forms of A. riparium by its usually spreading leaves, more slenderly 
acuminate and sometimes serrulate and its wide short leaf cells, 3-6: 1. Small 
poorly developed forms of A. varium having the costa end below apex are 
sometimes confused with a A. Kochii , but the costa is much thicker and the 
leaf cells as a rule shorter and broader. Amblystegium Kochii , as I find it, 
has the leaves ovate-lanceolate and narrower than figured in the Bry. Eur. 
where it was originally described, also less contracted at base, but my 
material agrees well with authentic European material and has been identi- 
