REVUE BRYOLOGIQUE. 
_ l'indiquer ; il ne s’agil pas d’une simple clef analytique, l’au- 
teur donne aussi la description des espèces, ce sont : Am- 
blystegiuom Sprucei, A, tenuissimum, A. subtile, A. confer- 
voides, À. irriguum, A. fluviatile, À. radicale, A. leptophyllum, 
À. curvipes, À. serpens, À. Juratzkanum , A. Kockii, A. hy- 
grophilum, A. riparium, A. leptophyllum, A. Hausmanni. 
Plusieurs variétés sont décrites comme nouvelles. 1 UE: 
C. Sani. — Commentatio de Harpidiis europæis inductiva 
(II Gratis-Beilage zum Bot. Centralblatt, Band 2, 1880, 
_ pag. 1-24). : 
C. SANIO. — Additamentum in Hypni adunci cognitionem 
(Ibid., Band 5, n° 3, 1881). 
C. Sani. — Addimentum secundum in Harpidiorum cogni- 
fionem ({bid., Band 13, 1883, p. 425-440). 
The innumerous forms of the subgenus Harpidium have 
probably puzzled most of bryologists. In Aevue Bryologique 
these mosses also have at times been the object of more 
exhaustive notes as for instance 1880 in page 29, where an 
account of D° Holler’s arrangement of the Harpidia is given, 
_ orin 1881 in p. 73-82, where M. Renauld’s very instructive 
paper on the French Harpidia is incerted, There remains, 
however , undoubtedly much to be studied before these : 
mosses may be said to be in a satisfactory way ‘cleared up. 
As a most important contribution in this respect D’ Sanio’s 
papers must be considered, founded, as they are, on a 
thorough study in nature. À more exhaustive analysis of 
the papers would be too long for the limited space of this 
Journal. On this account [ will here reproduce only the 
authors systematical arrangement of the Harpidia in bis 
last paper, leaving to those that have a greater interest In 
Harpidia to look for further information in the very €ex- 
haustive and instructive original papers. 
The author systematises the Harpidia as follows : 
L HARPIDIA EXANNULATA. 
1. Æypnum fluitans L. sensu ampliore. 
a fontanum Sendt. (xx plumolosum Sanio). 
8. exannulatum (Gümbel), b purpurascens Schpr., e serratum de 
Milde, d fuscum Sanio, e orthophyllum Milde. 
Y. falcatum Schpr. 
à. amphibium Sanio, a alpinum Schpr., b condénsatum 
Sanio (xx tenerrimum Sanio), c paludosum Sanio (xx terrestre 
Sanio), d flaccidum Sanio, e rigidum Sanio, f. submersum 
Schpr., g. dolichoneuron Sanio. 
