40 REVUE BRYOLOGIQUE 



of our district but through a coincidence of events we were 

 always in such a hurry, when meeting w^ith mountains, 

 destitute of calcium, that the examination of these roclvs 

 nmst become very incomplete. Consequently I found at the 

 Jenisei proportionally more of mosses that affect limestone 

 than of mosses, assigned exclusively to rocks, destitute of 

 calcium. The most southern place where I had opportunity 

 to herborize in rocks was Krasuojarsk, where both kinds of 

 rocks occurred; the most northerly place was the mouth of 

 the Nischnje Tunguska (65** 50' n, lat.), where the mountains 

 consisted exclusively of limestone. Because mountahis are 

 rare by the nether Jenisei, all mosses that thrive only in 

 rocks also, of course, must be very rare at the same part of 

 the river. Some of these mosses seemed to be indifferent to 

 the substratum, as Hypnum rugosum, cupressi forme, Leucodon 

 sciuroides, Orthotrichum anomalumj Amphoridhim Mouyeotli, 

 Torlula ruralis, Didymodon rubellus, Disiichium capillaceum, 



and Radula complanata. Only in rocks, destitute of calcium, 

 I ionni Andraea petrophila, Hypnum incurvatum, Barlramia 

 crispa, Webera elongata, Encalypla ciliata, Hedicigia ciliata, 

 Gximnua Muhlenbeckii and ovata^ Leptotrichum glauccscem. 

 Dicranutn longifoVmm, Weisia Schisfi, Cijnodontinm strumi- 

 fcrum and Jungermannlamxlvla. The limestone-rocks were, 

 on the contrary, ornamented with Ilyptmni fastigiatwn, Or- 

 Ihoihecium ru/esccns, intricalum (with fruits), Thujidium ta- 

 mariscimtm , Anomodon longifolius and viticuloms, Myurella 

 julacea and apiculata (both with fruits), Mnium hymenophyl- 

 toides, serralum audstellare, Distichium inclinatnm, Seligeria 

 Donnii, Encalypla procera, etc. 



Reviewing the way in w hich different families and genera 

 are represented at the Jenisei, we will find that the ^ni'a and 

 the Marchantiacex are most richly represented, either 

 showing a great variety of forms, some of which certainly 

 are, as yet, undescribed, besides which the Marchantiaceae 

 arc very often to be found in such an abundance as perhaps 

 in no other part of the earth. On that account, I am very 

 much inclined to call the valley of the nether Jenisei the re- 

 gion of the Mnia and the Marchanliaceae. Among other fa- 

 milies and genera that are more richly represented at the 

 Jenisei may be mentioned Splaclmacea (8 species), Encalypla. 

 Dicranum, Polytrichaccae, Sphagnum, etc. Very sparingly 

 occur, on the contrary, mosses that affect rocks, as for in- 

 stance in the first place nhacomitrium and Gnmwm. Only 

 once I found a RhacomitHum in the woodregion (or in a way 

 of about 14 degrees of latitude); the genus became a little 

 more frequently represented first in the lundra-region. Poor 

 m species w^re also Orthotrichum (only 4 species), Fissidens. 

 My one species), Tortula, Brachythecium. of which genus 

 only B. snlehrosiim was common, etc. 



