ANTHEROZOIDS OF MOSSES. 



EVER since I began the study of the mosses nearK' ten years 

 ago, I have been searching for moss antheridia with motile 

 antherozoids. My search was entirely fruitless until the 

 spring of 1899, when I collected some male heads of Polytrichiim 

 juniperinum about May 4th, a week or ten days after the snow- 

 had melted from over them. These heads were allowed to par- 

 tially dry in a plant press and were then kept about a week or rather 

 less in this half-dried condition. Then on mounting the antherida 

 in water whole swarms of antherozoids were seen not free, but 

 swimming with a rapid rotary motion, each inside of its own little 

 Capsule. 



P. commune starts earlier, and I ha\'e always been too late in 

 my attempts to get antherozoids from that species. 



Let those who wish to study these interesting objects collect 

 the male heads of P. juniperinum about two weeks after the snow 

 has gone from off them, and proceed as above. I may add that not 

 one botanist in a hundred has ever seen these bodies in motion. — 

 A. J. Grout. 



DISTRIBUTION OF THE EASTERN SPECIES OF MNIUM. 

 By Hi,i/.\heth (',. I-Skitton. 



I HE species of this genus are easily recognized li> their leaxcs 

 which are either doubly toothed, singly toothed, or entire, 

 and in all but two species bordered by longer, narrower cells. 

 A. — Leaves biserrate, margins bordered. 



1. M. hnrniim (L.) Hedw. In swamps and banks ot streams in 



woods. Along the Bronx river, Bronx Park. X. \'. Cit> ; 

 Can.. N. B., \. S., Nf., Ont., Me., N. H., \t.. Mass., R. Id., 

 Conn., N. V., N. j., ?a.. \'a., VV. \'a.. N. C. 



2. M. orlhorhynchum Br. & .Sch. On rocks .ilong streams. Cr., 



Lab., Can., Ont., Brit. Am., .\. N'.. Pa., Colo., Mont. 



V'ar. tenellum .Sch. Drummond's Mosses No. 5J(). (.1/. 

 inclinatum Mac. Cat. 141) Ont., K. M., B. C. 



{M. lycopodioides of L. & J. Man. non Hook.). (.1/. psm- 

 dolycopodioidcs C. M. & Kindb.) seems to be roterable to M. 

 nrthorhynchum. as none of the .^nierican specimens thus far 

 show any distinctive characters for sei)arating. The taller 

 plants with globose capsules resembling .1/. Iionmni of 

 Europe (Rab. Bry. Eu. .\o. 39), ha\e not thus far been 

 seen from .N. .Am. 

 T,. M. riparium Mitt. (.\/. parvum .Aust. ms. in herb. I .Sull. 

 & Les(j. Musci bor Am., .\o. 2()>i. fide Jaeger .Adumb. i«7.'^. 



