274 
FERNS : BRITISH AND FOREIGN. 
pound, rarely pinnate. Veins forked; venules free. Fertile 
segments rachiform, compound paniculate. Sporangia distinct, 
in two unilateral rows, opening vertically in two equal valves. 
1. B. simplex, Hitchcock ; Hook, et Grev. Ic. Fil. t. 82. — 
North America. 
2. B. Lunaria, Sw. ; Sclik. Fil. 1. 154 ; Hook. Gen. Fil. t. 47 A ■ 
Lindl. and Moore’s Brit. Ferns, t. 51 A ; Hook. Brit. 
Ferns, t. 48 ; Sowerby’s Ferns, t. 45. Osmunda 
Lunaria, Linn. Eng. Bot. t. 318; — ft rutaceum. 
Botrychium rutaceum, Sw. ; Sclik. Fil. t. 155 B. — 
Temperate Zone of the Northern Hemisphere. 
3. B. lunarioid.es, Sw. Botrypus lunarioides, Michx.; — 
ft obliquum, A. Gray. Botrychium obliquum, Muhl. 
B. lunarioides, Sclik. Fil. t. 157; — y dissectum, 
A. Gray. Botiychium dissectum, Spr. ; Sclik. Fil. 
1. 158. — North America. 
4. B. Virginicum, Willd. Osmunda Virginica, Linn. Botry- 
chium Yirginianum, Sw. ; Sclik. Fil. t. 156 ; Hook. 
Gard. Ferns, t. 29. — Temperate Zone of the Northern 
Hemisphere, Tropical America, East Indies, and 
Ceylon. 
Order IY.-LYCOPODIACE.ffi. 
Flowerless moss or fern-like plants, consisting of firm, erect, 
creeping or pendulous, simple or branched, often flagelliform 
stems, furnished with acerose, rusciform or jungermannia-like, 
sessile leaves, which are generally imbricate, and often disti- 
chous and of two kinds, bearing in their axis, or on contracted 
terminal spikes, 1-3-celled reniform or globose sessile spore- 
cases ( sporangia ), of one or of two forms ; one called Antheri- 
dangia, containing numerous spores ; the other Ooplioridangia , 
containing 1-3-8 large spores. 
158. PSILOTUM, Sw. 
Stems dichotomously forked, compressed or angular, rigid, 
erect or slender, pendulous ; leaves obsolete or small, bract- 
