Groutiella Steere

Yu, Ning-Ning & Jia, Yu, 2023, A world revisionary study of the genus Groutiella Steere (Orthotrichaceae, Bryopsida), Cryptogamie, Bryologie 20 (7), pp. 161-182 : 162-164

Genus Groutiella Steere

The Bryologist 53: 145 ( Crum & Steere 1950). — Macromitrium sect. Micromitrium Mitt. , Journal of the Linnean Society, Botany 12: 218 ( Mitten 1869). — Micromitrium (Mitt.) Schimp. ex Besch., Mémoires de la Société des Sciences naturelles de Cherbourg 16: 190 ( Bescherelle 1872), illeg. hom. non. Micromitrium Austin, 1870 . — Macromitrium subg. Micromitrium (Mitt.) Broth., Die Natürlichen Pflanzenfamilien I (3): 479 ( Brotherus 1902). — Craspedophyllum Grout , North American Flora 15 A: 38 ( Grout 1946), illeg. hom. non. Craspedophyllum Copeland, 1938 .

TYPE SPECIES. — Groutiella fragilis (Mitt.) Grout.

KEY TO THE SPECIES OF GROUTIELLA STEERE

1. Upper branch leaves gradually narrowed to a long subula and usually broken off ............................................ ............................................................................................ Groutiella tomentosa (Hornsch.) Wijk & Margad.

— Upper branch leaves obtuse, acute to acuminate, never forming a subula ...................................................... 2

2. Branch leaves ligulate to lingulate, apices obtuse to abruptly acuminate ........................................................ 3

— Branch leaves lanceolate to ovate-lanceolate, apices acute to acuminate ......................................................... 5

3. Branch leaves rugose above....................................................................................... G. obtusa (Mitt.) Florsch.

— Branch leaves smooth or undulate ................................................................................................................. 4

4. Length-width ratio of median branch leaves less than 3.5:1; branch leaves oblong to lingulate, often widest at or above the middle, ending in a short mucro; costa subpercurrent, in most leaves not filling the entire mucro ................................................................................................................................. G. tumidula (Mitt.) Vitt.

— Length-width ratio of median branch leaves more than 3.5:1; branch leaves ligulate to oblong, as wide above as below, ending in a long apiculus or cusp; costa excurrent and usually stoutly filling the apiculus ...................................................................................................... G. apiculata (Hook.) H.A. Crum & Steere

5. Branch leaf apices usually acute; costa ending below the apex, subpercurrent, percurrent or shortly and weakly excurrent ....................................................................................................................................................... 6

— Branch leaf apices acuminate and apiculate; costa stoutly excurrent............................................................... 7

6. Upper branch leaf apices fragile, often broken; branch leaves bordered in lower 1/4 or less by short rectangular cells; leaf mid-lower cells thin-walled, strong bulging .............................................. G. reesei (Vitt) B.H. Allen

— Upper branch leaf apices not fragile, usually intact; branch leaves bordered in the lower 1/3 to 1/2 by elongate linear cells; leaf mid-lower cells thick-walled, flat to bulging-tuberculate ......................................................... .................................................................................................... G. chimborazensis (Spruce ex Mitt.) Florsch.

7. Basal leaf cells tuberculate .................................................................... G. tuberculata B.H. Allen & I.H. Holz

— Basal leaf cells smooth ................................................................................................................................... 8

8. Branch leaves bordered up to 2/3 or more of the leaf length .............................................................................. ...................................................................................... G. husnotii (Schimp. ex Besch.) H.A. Crum & Steere

— Branch leaves bordered up to 1/3 or less of the leaf length................................................................................. ................................................................. G. macrorrhyncha (Mitt. ex Bosch & Sande Lac.) Wijk & Margad.