214 94. EQUISETACE^E. 



93. MARSILEACEJE. 



1. PlLULARIA. Pill-WOTt. 



P. GLOBULIFERA, L. Creeping Pill-wort, Pepper-grass. Khi- 

 zomes creeping, rooting at the joints. Le. very fine, setaceous, 

 erect, 4 5 in. high, circinate when young. Involucre at the base 

 of the le. like a small pea, covered with hairs. 



Rare. Margins of lakes and pools. (B) P. 68. Frankfield loch; Loch 

 Lomond, and Bishop loch, near Gartcosh station. 



94. EQUISETACE.33. 

 1. EQUIS^TUM. Horse-tail. 



A. Fertile stems appearing in early spring before the barren ones, 



unbranched, with long sheaths. 



1. E. TELMATEIA, Ehr. Great Water Horse-tail. Fruiting 

 stems simple, 8 10 in. high. Barren ones 3 4 ft. high, nearly 

 smooth, with about 30 striae, teeth of the sheath long, subulate ; 

 branches rough, simple, 4-angled with 4 small %-ribbed teeth; the 

 whorls crowded towards the apex of the stem. 



Rare. In marshy places, shady hanks, and muddy ditches. (E) P. 4. St. 

 Germans loch ; island of Arran. 



2. E. ARVENSE, L. Corn Horse-tail. Fertile stems simple, 

 3 6 in. high. Barren ones erect or decumbent, 1 2 ft. high, 

 with 12 14 strise. Branches simple, 3 4 angled, teeth of the 

 sheaths long, acute, 1-ribbed to the apex. Outline of frond taper- 

 ing to the top. 



Common. Roadsides and fields. (B) P. 4. 



3. E. UMBROSUM, Willd. Blunt-topped Horse-tail. Fertile 

 stems of 2 kinds, one short and quite simple, the other resembling 

 the barren stem, with a cone of small size. Stems 12 18 in. 

 high, with about 20 striw, rough ; branches long at the top, getting 

 gradually smaller below, simple 34 angled, with as many teeth, 

 not ribbed to the apex. 



Very rare. Banks of Clyde, near Newton ; Campsie glen ; Bonnington woods. 

 (S) P. 4. 



B. Fertile and barren stems nearly similar and appearing at the 



same time. 



4. E. SYLVATICUM, L. Branched Wood Horse-tail. Fertile 

 stems blunt at the apex. Barren ones tapering to the top, 

 12 18 in. high. Sheaths with 3 4 membranous lobes or teeth; 

 strise of the stem about 12. Branches compound, 10 16 in a 

 whorl, spreading or deflexed ; these branches are again whorled, 

 producing an extremely elegant and graceful fairy-like tree. 



Common. In moist woods and on hedge hanks. (B) P. 45. Old quarry 

 heyond Fossil, &c. 



