In moist places in brush-wood, on the margins of bogs, and the hke, between 

 Minusinsk and Kushabar. 



Distribution: Europe, Siberia, Sakhalin, the Amoor Province, Manchooria, North 

 America. 



Equisetum silvaticum L. Spec. PI. ed. II (1763) p. 1516; Ledeb. Fl. Alt. IV, p. 321; 

 Turczan. Cat. Baical. no. 1357; Ledeb. Fl. Ross. IV, p. 487; Turczan. Fl. Baical.-Dahur. 

 (1856, I) p. 67, no. 1367; Luerss. Farnpflanz. p. 648; KpBu. 'D.i. A.it. VII (1914) p. 1754. 



Dispersed in somewhat moist, frequently moss-grown places in forests of conifers 

 and foliferous trees in the Amyl valley, at Ust Algiac, near the Kamsara, and in the 

 woods between the dwellings of Kokus and Mosgalewski. 



Distribution: Europe, Siberia, eastern Asia, northern Mongolia, North America, 

 Greenland. 



Equisetum palustre L. Spec. PL ed. II (1763) p. 1516; Turczan. Cat. Baical. no. 

 1356; Ledeb. Fl. Ross. IV, p. 488; Luerss. Farnpflanz. p. 704; Turczan. Fl. Baical.- 

 Dahur. (1856, I) p. 68, no. 1369; Kpuji. $.i. Axr. VII (1914) p. 1756. 



Dispersed in moist places, frequently on Sphagnum-bo^s, and the like, in the subal- 

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

 Most of the specimens gathered belong to /. simplicissimum A. Br. in Sillim. Amer. 

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

 are also occasionally to be found the stems of which have short branches, only a few 

 cm. longvai:ueiiicillatlimMiLDEf.breviramosiunKLiKGE,ArcYi. Nat. Liv. Ehst. u. Curland 

 2. ser. VIII, p. 401. 



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

 The sporangia ripen at the beginning of July. 



Distribution: Europe, western Asia, Siberia, northern Mongolia, eastern Asia, Sak- 

 halin, Japan, North America. 



Equisetum Heleocharis Ehrh. Hannov. Mag. 1783, p. 286; L'pw.T. cpji. Ajt. VII (1914) 

 p. 1757. Equisetum 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. 



/. fluviatile Aschers. Fl. Brand. 1, p. 900. 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. 



f. 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 Ust 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 



