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DISTRIBUTION OF SPECIES 121 
ing the writer to examine type specimens in their charge, and 
other correspondents have kindly furnished material for study. 
Analytical Key to the Species 
1. Underleaves present, undivided. 2. 
Underleaves present, bifid. 6. 
Underleaves absent. 19. 
2. Plants pale, perianth five-keeled. 3 
Plants more or less tinged with brown or purple. 5. 
3. Lobule bluntly pointed at the apex or apículate. I. Archilejeunea clypeata. 
Lobule with a TM and slender apical tooth. 4. 
4. Lobe widely slightly convex or plane, averaging 1.2 X 0.95 mm., postical 
margin usually fadi ng a distinct angle with keel. 2. Archilejeunea Sellowiana. 
Lobe obliquely spreading, strongly convex, averaging 0.7 X 0.45 mm., postica al 
margin usually forming a continuous line with keel. 3. A rchilejeunea eonchifoha. 
5. Lobule entire on margin or with a Aen apical e, — leaf-cells averaging 
21 X 12 a inflorescence usuall g , perianth trigonous 
throughou 4. Mastigljeune a auriculata. 
Lobule ae d on margin with about four teeth, median leaf-cells averaging 23 
H, 9 inflorescence usually innovating on both sides, perianth six- to eight- 
plicate i in upper part. s. Brachiolejeunea corticalis, 
6. Lobe acute, at least on well developed leaves, underleaves with rounded division, 
and broad, shallow s . Harpalejeunea ovata. 
Lobe rounded or rarely تن‎ underleaves with obtuse to acute divisions and nar- 
row sinus. 7 
7. Plants firm in texture, yellowish- or brownish-green, inflorescence dioicous. 8. 
Plants delicate in texture, whitish or pale green, varying to dark green. 10. 
8. Underleaves small, distant, narrowed toward base. ۰ Euosmolejeunea duriuscula. 
se : 
Underleaves large, contiguous to imbricated, rounded or cordate at 
9. Leaves loosely imbricated, the lobe broadly ovate, obliquely spreading. 
8. Euosmolejeunea opaca. 
Leaves densely imbricated, the lobe orbicular, widely spreading. 
9. Cheilolejeunea polyantha. 
10. Branches sometimes flagelliform and leafless but with persistent underleaves, € 
inflated, perianth (so far as known) with a plane antical face. I. 
Branches never flagelliform. 
II. Lobes without basal ocelli, median leaf-cells vasis 21 u in diameter, inflores- 
ence autoicous. joe ejeunca phyllobola. 
Lobes with basal ocelli, median leaf-cells averaging IO u in diameter, inflorescence 
ioicous 11. Cheilolejeunen versifolia. 
12. 
12. Lobule u not inflated, inflorescence autoicous, perianth plane or nearly so on 
antica 12. Cheilolejeunea pililoba. 
13. 
Lobule vowel perianth with a distinct antical keel. 
m 
دیا‎ 
. Lobe widely spreading, inflorescence auto ico 14. 
Lobe obliquely spreading to suberect, ehe dioicous. 
16. 
