Acutifolia

Costa, Denise Pinheiro Da, 2018, New synonyms for Brazilian Sphagnaceae, Subgenus Acutifolia (Bryophyta), Phytotaxa 347 (4), pp. 292-296 : 295

Key to the Brazilian species of the subgenus Acutifolia

1. Stem leaves bordered, the border narrow above, somewhat broadened toward the base ..................................................................2

1. Stem leaves not or slightly bordered at base ...................................................................................................................................... 5

2. Leucocysts of branch leaves without pores or few pores on the inner surface ..................................................................................3

2. Leucocysts of branch leaves with many pores on the inner surface...................................................................................................4

3. Stem leaves lingulate, apex rounded, somewhat more broadly bordered at base; leucocysts of branch leaves on the outer surface with 2–5 narrowly elliptic, ringed pores contiguous to the commissural and corners, on inner surface without pores or rarely pores .................................................................................................................................................................................. S. sehnemii

3. Stem leaves triangular, apex abruptly pointed, abruptly bordered at base; leucocysts of branch leaves on the outer surface with 2–7 elliptic pores at ends and commissures, on the inner surface without pores or with 1–3 pores near leaf margins ....... S. aciphyllum

4. Leucocysts of branch leaves with few and small pores at the corners on the inner surface .............................................. S. tenerum

4. Leucocysts of branch leaves with 2–5 pores at cells end on the inner surface .......................................................... S. capillifolium

5. Chlorocysts (cross section) oblong, lenticular to fusiform, exposed on both surfaces ......................................................... S. costae

5. Chlorocysts (cross section) triangular to trapezoidal, exposed on inner surface ..............................................................................6

6. Branch leaves with a marginal resorption furrow, strongly involute-concave, ovate, bordered by 1–2 rows of linear cells, leucocysts on the outer surface with 2–5 large, elliptic ringed pores, contiguous at commissures ......................................................... S. molle

6. Branch leaves without a marginal resorption furrow, not strongly concave, oblong-lingulate to triangular-ovate, slightly bordered at base, leucocysts on the outer surface with 3–8 small, ringed, rounded or elliptic pores at commissures..................... S. sparsum