Hypnum.~\ 
IV. MUSCI. 
469 
* Nerve vanishing below the middle. 
Leaves circinate, striate, subserrulate 6. II. uncinatum. 
Leaves not striate, deltoid at the base, quite entire 7 .if. Kneiffii. 
Leaves not striate, lanceolate, quite entire or subserrulate .... 8. H.fluitans. 
Leaves circinate, lanceolate from an ovate base, quite entire . . . 9. if. brachiatum. 
** Nerve continuous. 
Leaves cordate at the base, quite entire 10. H. filicinum. 
Leaves oblong- or linear-lanceolate, serrate 11. if. limbatum. 
C. Hispida . — Stems rigid, stiff, sparingly branched. Leaves falcate and secund, nerve 
very stout. 
Leaves ovate, rigid, nerve excurrent . 12. II. hispidum. 
Leaves ovate, rigid, nerve vanishing 13. if. glauco-viride. 
Leaves lignlate from an ovate base 14. H. umbrosum. 
D. Cupressiformia. Stems flattened. Leaves more or less secund, falcate or circinate, 
imbricate all round the stem or obscurely 2-farious ; cells at the outer base often large ; 
nerve 0 or 1-2, short. Fruitstalk smooth (rather rough in if. cerviculatum ). — Species very 
difficult of discrimination. 
* Opercidum as long as the capsule. 
f Leaves strongly falcate or circinate. 
Leaves lanceolate, long acuminate ; perichsetial serrulate . . . .15. if. cerviculatum. 
Leaves linear-lanceolate ; perichaetial similar. Branches long . .16. N. tenuirostre. 
Leaves linear-lanceolate ; perichaetial broader. Branches short . . 27. LL. amcenum. 
++ Leaves slightly falcate, 
a. Leaves quite entire or obscurely serrulate. 
Leaves lanceolate, subpiliferous. Capsule pendulous 18. if. crassiusculum. 
Leaves oblong, acuminate ; perichaetial similar. Capsule horizontal 19. M. Jolliffii. 
Leaves ovate or oblong, acuminate ; perichaetial narrower. Capsule 
suberect ' 20. if. homomallum. 
Leaves lax, minute, lanceolate. Capsule pendulous 21. H. molliculum. 
y8. Leaves distinctly serrulate. 
Leaves deltoid-ovate 22. H. pubescens. 
Leaves linear-lanceolate 23. H.leptorhynchum. 
** Operculum shorter than the capsule. 
f Leaves entire or nearly so, nerveless. 
a. Leaves strongly falcate, ovate-lanceolate. 
Leaves acuminate; perichaetial setaceous 24. H. chrysogaster. 
Leaves acuminate ; perichaetial subpiliferous 25. H. cupressiforme. 
Leaves subpiliferous. Capsule pendulous 26. if. mundulum. 
Leaves subpiliferous. Capsule suberect 27- if. limatum. 
fi. Leaves obscurely falcate-secund. 
Stems short, slender. Leaves narrow-lanceolate 28. H. pulchellum. 
Stems elongate, slender. Leaves oblong-lanceolate 29. H. acutifolium. 
ft Leaves 2-nerved, serrulate, strongly falcate. 
Stems pinnately brauched. Capsule pendulous 30. H. sandwicense. 
E. Pr^longa. Leaves spreading, imbricate all round the stem, not squarrose nor secund, 
serrulate in the N. Z. species ; nerve reaching about halfway up. Fruitstalk scabrid ; oper- 
culum beaked. — Small-leaved species, always creeping or prostrate. (Leaves subsecund in 
H. austrinum.) 
Leaves lanceolate, subpiliferous . . .31. H. muriculatum. 
