Rhynchostegiella (Schimper, 1852) Limpricht, 1896

Guerra, Juan, Ríos, Diana & Gallego, María Teresa, 2014, A revision of the genus Rhynchostegiella (Brachytheciaceae) in the Iberian Peninsula and Balearic Islands, Phytotaxa 183 (3), pp. 193-200 : 194

Key to the species of Rhynchostegiella in the Iberian Peninsula and Balearic Islands

1. Leaves usually long–acuminate, linear–lanceolate to triangular–lanceolate .....................................................................................2

- Leaves usually short–acuminate, triangular–lanceolate to oval–lanceolate or oblong–lanceolate ....................................................3

2. Seta smooth, rarely a few rugose at base; costa finishing at 3/4 leaf length, sometimes excurrent as a acumen or percurrent; spores 10–15 µm in diameter................................................................................................................................................................... 1. R. tenella

- Seta strongly papillose; costa finishing at 1/2–2/3 leaf length; spores 14–22 µm in diameter ........................................ 2. R. litorea

3. Costa (40)45–50(55) µm wide at base, percurrent or finishing a few cells below apex ............................................. 3. R. teneriffae

- Costa (25)30–40(45) µm wide at base, finishing 2/3–3/4 leaf length ................................................................................................4

4. Seta papillose; alar cells not differentiated; leaves weakly concave to flat.................................................................. 4. R. curviseta

- Seta smooth; alar cells differentiated; leaves concave ............................................................................................ 5. R. bourgaeana