594 MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 
the leaves on the ultimate branchlets being irregularly spirally 3-5-stichous, falcate 
patent. The barren branches, above or near the peduncles, usually show adpressed 
2-ranked leaves. 
[The Indian plants placed in Lycopodium, sect. Stipulate, by Hk. & Grev. in Hook. : 
Bot. Misc. ii. 378, as well as L. divaricatum, Hk. & Grev. Le 377, are Selaginellas, as 
are Lycopodium miniatosporum, cespitosum, and curvatum of Dalzell in Hook. Kew 
Journ. 1862, 114.] | 
53. EquisETUM, Linn. 
Stems erect, striated, articulated and sheathed at the nodes; branches verticillate, 
leafless. Spores under the heads of peltate stalked scales closely aggregated in terminal 
cones; spores spherical, functionally equivalent to those of ferns, but enveloped spirally 
by two linear spathulate hygrometric elaters. 
1. E. ARVENSE, Linn. Sp: Pl. 1516. Fertile stems appearing before the barren, usually 
quite simple; cone peduncled, teeth of the sheath below the cone lanceolate-linear ; 
barren stems with whorled branches usually narrowed upwards.—Schk. Krypt. Gew. 
t. 167; Engl. Bot. t. 2020; Hook. Brit. Ferns, t. 60; Duval-Jouve, Hist. Nat, 
Equiset. 242-244; Milde, Fil. Europ. 217, Monogr. Equiset. 218-239, tt. 1-3. 
Kumaon ; Pindari, alt. 12,000 feet, and Runkim, alt. 13,500 feet, Strachey 5 Winter- 
bottom. Kashmir and Dras, Dr. Henderson.—Distrib. Europe, North and Central Asia, 
North America. 
There are only 2 Himalayan examples of this at Kew; and Milde quotes one 
other. 
2. E. pirrusuM, Don, Prodr. Fl. Nep. 19. Fertile and barren stems similar, branched; 
branches from the main stem at their base ascending; cones mostly peduncled, sub- 
solitary (i.e. there is very rarely another cone adjacent on the same branch) ; teeth 
of the sheath below the cone lanceolate-linear caudate, grooved on their keel.—Milde; 
Fil. Europ. 226, Monogr. Equiset. 302-310, t. 11. E scoparium, Wall. Cat. 398. 
Himalaya, alt. 1000-7000 feet; from Gurwhal to Mishmee, very common. Khasia, — 
ait. 1000—4000 feet; common.—Distrib. Moulmein. $e 
This has much the general habit of E. palustre, Linn.; and Mettenius has named one . e 
of Griffith’s Khasi plants E palustre, which differs (inter alia) by the much less caudate ` ` 
teeth of the upper sheaths. i | 
3. E. DEBILE, Wall. Cat. 397. Stem thick, hollow, weak, fertile and barren similar, 
branched; branches from the main stem at their base patent at right angles to it; 
cones short-peduncled and sessile, often several approximated, owing to fertile g : 
branches springing close below a cóne; teeth of the sheath below the cone lan- 
. ceolate-linear caudate, grooved on their keel, brittle deciduous, so that the older 
sheaths appear mostly truncate.—Roxb. in Cale. Journ. Nat. Hist. iv. 468, t. 265 
