Ceratolejeunea, Jack & Stephani, 1892

Bastos, Cid José Passos & Vilas Bôas-Bastos, Silvana B., 2019, A new species of Ceratolejeunea Jack & Steph. (Lejeuneaceae, Marchantiophyta) from Brazil, Phytotaxa 394 (1), pp. 119-122 : 121

Key for the Brazilian species of the genus Ceratolejeunea

1. Underleaves entire.......................................................................................................................................................... C. desciscens

1. Underleaves bifid................................................................................................................................................................................2

2. Ocelli seriate or moniliate..................................................................................................................................................................3

2. Ocelli basal or suprabasal, rarely seriate............................................................................................................................................5

3. Ocelli seriate...................................................................................................................................................................................... 4

3. Ocelli moniliate .............................................................................................................................................................. C. rubiginosa

4. Underleaves ovate, distant.............................................................................................................................................. C. ceratantha

4. Underleaves reniform, contiguous or imbricate ..................................................................................................................... C. fallax

5. Perianth with bulbous horns; lobule with a sharp, long apical tooth................................................................................. C. atlantica

5. Perianth with horns various but not bulbous, or with rounded keels; apical tooth short or long.......................................................6

6. Dorsal and ventral margin of the leaf lobe dentate................................................................................................................ C. filaria

6. Dorsal and ventral margin of the leaf lobe smooth or dentate only near the apex.............................................................................7

7. Leaf lobule with free margin strongly involute, with narrow tubular opening into the water sac; apical tooth hidden, acute; ocelli usually single ............................................................................................................................................................... C. patentissima

7. Leaf lobule with free margin involute or plane, without narrow tubular opening into water sac; apical tooth visible; ocelli various............................................................................................................................................................................................................8

8. Underleaves suborbicular to orbicular............................................................................................................................ C. guianensis

8. Underleaves ovate to oblong, or reniform..........................................................................................................................................9

9. Ocelli single or indistinct; plant generally in flooded habitats....................................................................................... C. temnantha

9. Ocelli various, distinct, plants in emergent habitats.........................................................................................................................10

10. Perianth with surface strongly roughened by mammillose cells, horns branched; utricule and spherical lobules absent; plants constantly autoicous .................................................................................................................................................... C. maranhense

10. Perianth with smooth cells, not branched horns; utricule and sphaerical lobules present or absent; plants dicoicous or autoicous .............................................................................................................................................................................................................11

11. Underleaf margin always bearing a single tooth per side, sinus U-shaped .......................................................................... C. minuta

11. Underleaf margin entire or occasionally dentate, sinus V-shaped....................................................................................................12

12. Perianth without horns, the keels rounded; spherical lobules lacking; uticule absent or present....................................................13

12. Perianth with horns; spherical lobules present, occasionally absent; utricule present or absent.....................................................15

13. Leaf lobule with free margin plane, apical tooth long, oblong, hook-shaped; utricule absent................................. C. falcatodentata

13. Leaf lobule with free margin mostly involute, rarely plane, apical tooth short or long, acute or curved, but not oblong, hook-shaped; utricule present or absent..................................................................................................................................................................14

14. Underleaf large, 160‒312 μm wide, reniform or ovate, caducous leaves not observed; utricule present, occasionally not observed ............................................................................................................................................................................................. C. confusa

14. Underleaf smaller, ca. 136−200 μm wide, ovate; caducous leaves frequent; utricule absent ......................................... C. laetefusca

15. Leaf lobe asymmetrically ovate, dorsal margin arched, dentate, ventral margin straight, apex acute, entire..................... C. coarina

15. Leaf lobe ovate, dorsal margin entire or with tooth restricted to apex, ventral margin slightly arched, apex rounded to acute......16

16. Underleaf ovate, base cuneate, occasionally toothed in the margin; basal ocelli geminate; spherical lobules and utricule absent..... ........................................................................................................................................................................................... C. cubensis

16. Underleaf reniform, rarely ovate, margins entire; basal ocelli geminate or seriate; spherical lobules and utricule frequen ............... ............................................................................................................................................................................................. C. cornuta