Trichosteleum

Evangelista-Dos-Santos, Milena, Peralta, Denilson F., Valente, Emilia De Brito & Câmara, Paulo E. A. S., 2023, A new species of Trichosteleum (Sematophyllaceae, Bryophyta) from Brazil, Phytotaxa 578 (3), pp. 297-300 : 299

Key to the Brazilian species of Trichosteleum

1. Leaves falcate ..................................................................................................................................................................... T. glaziovii

- Leaves erect........................................................................................................................................................................................2

2. Leaves ovate, orbicular or elliptic ................................................................................................................................. T. amnigenum

- Leaves oblong, lanceolate, oblong-lanceolate or ovate-lanceolate ....................................................................................................3

3. Leaves oblong; apex obtuse or acute..................................................................................................................................................4

- Leaves lanceolate, oblong-lanceolate or ovate-lanceolate; apex acute, acuminate or long-acuminate .............................................6

4. Alar cells inflated, oblong-rectangular to rounded, hyaline; cells at apex linear; papillae absent ........................... T. lonchophyllum

- Alar cells enlarged, inflated, oblong; cells at apex rhomboidal, fusiform or linear; papillae conspicuous, in upper ⅔ of leaf .........5

5. Margins serrulate; alar cells inflated, rounded; cells at apex linear ................................................................................ T. glaucinum

- Margins entire; alar cells inflated, oblong-rectangular; cells at apex rhomboidal to fusiform .................................. T. subdemissum

6. Leaves 0.6–0.9 mm; apex sometimes reflexed, gradually long-acuminate.......................................................... T. longiacuminatum

- Leaves 1.1–1.6 mm; apex not reflexed, acuminate to acute...............................................................................................................7

7. Alar cells acroporoid type, without supra-alar cells.................................................................................................. T. brachydictyon

- Alar cells brotheroid type, alar cells in 1–3 rows...............................................................................................................................8

8. Apex long acuminate, crispate; papillae high, as wide as the lumina, ¾ of leaves........................................................... T. sentosum

- Apex acuminate, not crispate; papillae high, ½ of leaves .............................................................................................. T. papillosum