REVUE BRYOLOGIQUE 193 
endeavour to render the results of the excellent work of Sanio 
and Renauld more easy of quotation, by reducing them to the 
ordinary system of nomenclature. I have attempted to combine 
with them some of the recent additions of Warnstorf. The spe- 
cies are admittedly of very unequal value, as they are in most 
large genera, so much so that the recognition of subspecies 
appears to only partially indicate their several degrees of impor- 
tance, If it be desirable to indicate the weaker assemblages as 
subspecies, that rank might be assigned to n° 1, 2, 3 and 4; 
and to n° 7 a by those who do not feel convinced of its hybrid 
origin. But the close affinity of the whole of them seems to be 
sufficiently indicated by uniting them as a distinct subsection of 
the Harpidia. The disappearance of such aggregate and dubious 
names as Hypnum aduncum and Hypnum Kneiffii, sometimes 
used in a broad and at others in a narrow sense, cannot be 
regretted, as it will remove a frequent source of ambiguity. 
Puzzling forms will occasionnally oceur which cannot be referred 
_ Lo any species without some explanatory phrase, but such aber- 
rant examples are found in all critical groups of plants. Some of 
these are abnormal growths of only pathological interest, but 
whieb, if taken seriously by the systematist, will speedily reduce 
any method of classification Lo chaos. After more attention has 
been devoted to the ecology of these plants,we may be in a better 
position to judge which groups of characters are the most impor- 
tant and permanent, thus arriving at a better understanding of 
the value of the various species recognized below. 
SECTION HarPipitM Sull. 
Subsection Harpidia adunca Sanio 
1. Hypnum polycarpon Bland, (= I. Kneïflii Schp. ). 
Var. intermedium Schp. 
f. laxa (Ren.). 
f. laxifolia (Ren.). 
| f, penna (Sanio). 
Var. attenuatuüum (Boul.). 
Var. Rollii (Ren). 
Var. asturicum (Ren.). 
2. Hypnum simplicissimum Warnst. 
Var. immersum Warnst. 
Var. diversifolium Warnsl. 
Var. tenuis Warnst, 
3 (9. Hypnum subaduncum (Warnst.) (= H. aduneum Hedw. 
f. falcata Ren.) 
(t) Excluding the synonyme H. aduncum pue gracilescens Sanio. 
Comm. (1880). 
