. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. strongly serrate above ; inflated alar cells very conspicuous g. 5. Inflated alar cells numerous and conspicuous; capsules plicate when dry . . alar cells rather feu 6. 6. Not regularly pinnate ; habit of Plagiothetium pralense. Regularly pinnate 7. 7. Stems reddish ; capsules cylindric, little curved and suberect impoiieiis. Stems not noticeably reddish ; capsules curved and inclined 8. S. Plants small, yellowish ; capsules not plicate fertile. Pl
. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. strongly serrate above ; inflated alar cells very conspicuous g. 5. Inflated alar cells numerous and conspicuous; capsules plicate when dry . . alar cells rather feu 6. 6. Not regularly pinnate ; habit of Plagiothetium pralense. Regularly pinnate 7. 7. Stems reddish ; capsules cylindric, little curved and suberect impoiieiis. Stems not noticeably reddish ; capsules curved and inclined 8. S. Plants small, yellowish ; capsules not plicate fertile. Plants larger, dark green; capsules plicate when dry curvifolium. g. Leaves in two rows, appearing more or less complanate ; capsules curved and inclined ; cilia of peristome one or two 10. Leaves not appearing complanate ; capsules erect and symmetric or nearly so ; cilia none or rudimentary leniiiroslris. 10. Plants larger, bright glossy yellow-green ; urn of capsule twice the length of operculum recurtaiis. Plants smaller, usually darker green, growing at high altitudes; urn about the length of operculiim Figure 181. Leaves, leaf structure and paraphyllia of Hypnum Crista-castrensis (From Bry. Eur. HYPNACEAE 349 11. Plants \ery large and beautifully plumosely branched ; leaves plicate Cnsla-caslremis. Plants smaller, less plumose; leaves not plicate 12. 12. Stems reddish; quadrate alar cells not very numerous impoiiens. Stems not noticeably reddish ; quadrate alar cells numerous 13. 13. Leaves cordate at base molluscum. Leaves not cordate at base 14. 14. Leaves entire or serrulate above cuprnsiforme. Leaves serrate above, serrulate nearly or quite to base i v 15. Capsules loiigt cur\ed anil somewhat contracted below the mouth when dry rf-l)tile. Capsules i-i.^ long, symmetric and not contracted below the mouth; plants of high altitudes only pn/lesceiu. ^:f-:jX.
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