Pterobryopsis, M. Fleisch., 1905

Daniels, A. E. D., Athira, S., Kuznetsova, O. I. & Ignatov, M. S., 2024, Pterobryopsis siheiana (Bryophyta: Pterobryaceae) - a new species from the Western Ghats of India, Phytotaxa 650 (2), pp. 179-184 : 183

Key to the species of Pterobryopsis from India

1a. Branch leaves costate .........................................................................................................................................................................2

b. Branch leaves ecostate.................................................................................................................................................... P. gedehensis

2a. Costa single ........................................................................................................................................................................................3

b. Costa double ...................................................................................................................................................................... P. aurantia

3a. Branch leaves long-acuminate at apex ......................................................................................................................... P. crassicaulis

b. Branch leaves shortly acuminate, acute to narrowly acute or apiculate at apex ................................................................................4

4a. Stem leaves distinctly cucullate..........................................................................................................................................................5

b. Stem leaves not or only slightly cucullate........................................................................................................................................10

5a. Stem leaves ovate-cochleate, acute at apex................................................................................................................. P. scabriuscula

b. Stem leaves oblong-ovate or ovate to ovate-cordate, shortly acuminate to apiculate at apex ...........................................................6

6a. Stem leaves oblong-ovate; costa extending to just below apex .......................................................................................... P. flexipes

b. Stem leaves ovate to ovate-cordate; costa shorter, ending well below apex ......................................................................................7

7a. Branch leaves ovate-cordate, shortly apiculate at apex.................................................................................................. P. acuminata

b. Branch leaves ovate to oblong-ovate, acuminate at apex...................................................................................................................8

8a. Branch leaves ovate; costa reaching midleaf leaf or shorter ............................................................................................ P. orientalis

b. Branch leaves oblong-ovate; costa reaching beyond midleaf ............................................................................................................9

9a. Stem and branch leaves dimorphic..................................................................................................................................... P. siheiana

b. Stem and branch leaves monomorphic............................................................................................................................... P. schmidii

10a. Branch leaves distinctly toothed at margin; alar cells rectangular to subrectangular; capsules erect, cylindric.............. P. divergens

b. Branch leaves entire to faintly toothed at margin; alar cells quadrate to subquadrate; capsules suberect, ovoid-cylindric ................ .......................................................................................................................................................................................... P. kegeliana