Ill iiioisl |)l;ic('s ill lirusli-wood, on llu' iiuugiiis ol' bogs, and llic like, between 

 .Miiuisiii,si< and Ivnsliaiiar. 



Dislrihnlion: I'liiropc, Silicria. Sakhalin, llu- Aiiioor I'loxincc Maiuliooi ia. North 

 AnuM'ii'a. 



Kquisetuni silvaliciim L. Spre-. VI cd. 11 (17(i:5) p. I.'jK); Lcdc-h. V\. Alt. IV. p. :V2\; 

 riui/an. ("at. Baiiai. no. 1357; Ledoh. Fl. Ho.ss. 1\', p. IcST; ruivzan. I'"l. Baical.-Daluir. 

 (1851), I) p. 67, no. 13(17; Luerss. Fanipflanz. p. 648; l.>i,i.i. 'I'.i. .\.ii. VII (1911) p. 1754. 



Disprisod in somewhat moist. frcHpiently mo.s.s-gi'o\vn j)hu'i's in I'orosts of conifers 

 and lolilerous trees in the .Vinyl valley, al Ust Algiac, near the Kam.saia, and in the 

 woods between the dwellings of Kokus and Mosgalf:wsivi. 



Distiihntion: iMirope. Siberia, eastern .\sia. noitliciii .Mongolia. North America, 

 Greenland. 



Equisctuin palusire L. Spec. PI. ed. 11 (17()3) p. 1516: Tnic/an. Cat. Baical. no. 

 1356; Ledeb. Fl. Ross. l\. p. 188; Lueiss. Farnpflanz. p. 704; Tnrczan. Fl. Baieal.- 

 Dalnir. (1856. I) p. 68. no. 1369; I.'pi.i.i. 'I'.i. A.ir. VII (1911) j). 17.5(1. 



Dispersed in moist places, frequently on Spliafiniuu hoos. and the like, in the subal- 

 pine woodlands between Kushabar and Ust Algiac, and in swamjis near Ust Kamsara. 

 Most of the specimens gathered belong to /". simplicissinumi A. Hu. in Sii.mm. Amer. 

 .lourn. XLVI (1844) p. 85. distinguished by completely branchless stems. Specimens 

 are also occasionally to l)c found the steins of which have short branches, only a few- 

 cm. long ;7r;/. ()rr//(77/a/(;;N Mil. i)i;/. /)n'('m(//KW/;/N Ki.ixGi:, Arch. Nat. Liv. Eh.st. u. Curland 

 2. ser. VIII. p. 401. 



There occur numerous intermediate forms between the above-mentioned ones. 

 I'he sporangia ripen at the beginning of July. 



Distribution: Euroijc. western Asia, Siberia, northern Mongolia, eastern Asia, Sak- 

 halin. Japan, North America. 



Equisctum Heleocharis Ehrh. Hannov. Mag. 1783, p. 286; l.'pi.i.i. <1m. A.it. VII 11914) 

 p. 1757. Eqiiiseliim limosum L. Spec. PI. ed. II (1763) p. 1517; Ledeb. Fl. Alt. IV, p. 322; 

 Turczan. Cat. Baical. no. 1359; Ledeb. Fl. Ross. IV, p. 489; Turczan. Fl. Baical.-Dahur. 

 (1856, I) p. 69, no. 1370; Luerss. Farnpflanz.p. 715. 



/. fhwiatile Aschers. Fl. Brand. 1, p. 9U0. Rather common in muddy places along the 

 Yenisei and the river Abakan, where the spores seem to ripen in the second half of 

 June. I have also gathered it on the banks of the Sisti-kem and on the Bei-kem, near 

 the mouth of the Tara-kem. 



/. limosum Aschers. Fl. Brand. 1, p. 900. In swampy places on the banks of the 

 Yenisei, near Ust Abakansk, and on the borders of a small lake in an islet in the Yenisei, 

 between Minusinsk and l\st Abakansk. A very short form, with stems only about 10 

 cm. high, gathered by me in muddy places on the river Abakan, near Askys, with nearly 

 ripe spores in the second half of June. 



107 



