—10— 



MNIUM FLAGELLARE SULL. AND LESQ. IN NORTH 



AMERICA 



R. S. WILLIAMS 

 In a small collection of mosses made by Miss Ruth Mylroie on 

 Kodiak Island, Alaska, in 1911 were found some very interesting 

 specimens of a sterile Mnium that proved to be M. flagellare Sull. & 

 Lesq. The type locality of this species is Hakodadi, Yesso, Japan, 

 where it was collected by Charles Wright in 1855, in connection with 

 the North Pacific Exploring Expedition under John Rodgers, and up 

 to this year it has been known only from Japan and from the region 

 of the Amoor or Sachalin River, including Sachalin Island opposite 

 the river's mouth. The plant takes its specific name from the abund- 

 ant flagella, 3 or 4 mm. long, that grow out from around and among 

 the antheridia and archegonia of the terminal flower buds. The 

 Alaska specimens show stems, radiculose below, with oblong elliptic, 

 acute, rather distant and long-decurrent leaves, 2 to 2.5 mm. long ; 

 leaf border of a double thickness of cells about 2 cells wide and more 

 or less doubly serrate two-thirds down the leaf ; costa percurrent, at 

 least in upper leaves and smooth on back; leaf cells, with thin walls» 

 prominently mamillate-papillose on both sides, the median cells about 

 Ml*- or rarely 16/^ in diameter. Brotherus in Engler & Prantl gives 

 only one other species of Mnium, found in China and Japan, having 

 the leaves thus roughened on both sides. 



Fig. 1. Cross section through middle of leaf of Afwww flagellare X 135^ 



New York Botanical Garden. 



HEDWIGIA ALBICANS (WEB.) LINDB. ON LIMESTONE 



H. S. JEWETT, M. D. 



Limpricht gives the habitat of this moss as being "on stones and 

 rocks of all kinds {not, however, on limestone^, exceptionally on roofs." 

 Roth says, "on open-lying as well as shaded stones and rocks, with 

 the exception of limestone." (Italics mine.) Husnot, and Dixon and 

 Jameson say "on siliceous rocks," Braithwaite, "on rocks." L. and 

 J. Manual "On rocks boulders of sandstone and granite.'' 



On Sept. 20, 1911, near Yellow Springs. Ohio, (16 miles N. E. 

 of Dayton,) I found Hedwigia albicans iysi^h.) Lindb. (determination 

 confirmed by Holzinger) flourishing on blocks of limestone (car- 

 bonate of lime 85 per cent., carbonate of magnesia 12 per cent.) 



Prof. Holzinger writes me "We have the same thing here in S. E. 

 Minn., also on calcareous sandstone.'' 



Truly a cosmopolite — inhabiting nearly every part of the world, 

 and able to adapt itself to the conditions present at each station, if it 

 does not find the soil most congenial to it. Dayton, Ohio. 



