Tropicos | Name - Acroporium Mitt.

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Acroporium Mitt.

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1. Plants very small, densely branched; leaves mostly cylindrical to acicular when dry, less than 1.25 mm long excluding leaf acumen; leaf cells somewhat mammillose or weakly papillose............................................... 2

1. Plants small to large, distantly branched; leaves not cylindrical or acicular when dry, more than 1.25 mm long excluding leaf acumen; leaf cells smooth................................................................................................... 3

2. Plants without slender branches; leaves acicular when dry; leaf cells slightly mammillose or occasionally low unipapillose; setae less than 10 mm long............................................... 2. A. diminutum

2. Plants with numerous slender, erect branches; leaves more or less cylindrical; leaf cells clearly unipapillose; setae longer than 10 mm......................................................................... 3. A. lamprophyllum

3. Leaves often erect-spreading, broadly ovate to oblong-ovate, acute to shortly acuminate at apex, broadly cordate at base........................................................................................................................4

3. Leaves often falcate, lanceolate to narrowly lanceolate, long acuminate at apex, narrowly cordate at base.. 7

4. Plants small; leaves less than 2 mm long; setae less than 15 mm long................................ 5. A. secundum

4. Plants large; leaves more than 2 mm long; setae more than 15 mm long.................................................... 5

5. Plants in dense cushions; synoicous (with antheridia and archegonia mixed in the same gametoecium).........

....................................................................................................................1. A. condensatum

5. Plants in loose tufts or lax mats; dioicous or autoicous..................................................................6

6. Leaves 1.5–2.0 mm × 0.50–0.75 mm, often falcate at apices............ 6a. A. stramineum var. stramineum

6. Leaves 2.0–3.0 mm × 1.0–1.25 mm, rarely falcate.................................. 6b. A. stramineum var. turgidum

7. Plants small; leaves less than 2 mm long......................................................4. A. rufum

7. Plants large; leaves more than 2 mm long....................................................7. A. strepsiphyllum