Tropicos | Name - Leskeaceae Schimp.

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Leskeaceae Schimp.

Project Name Data (Last Modified On 2/20/2009)

Acceptance : Accepted

Project Data (Last Modified On 3/27/2009)

General Reference:

Wu Peng-cheng, M. R. C. & S. He. 2002. Hookeriaceae–Thuidiaceae. 6. viii + 221 pages. In Moss Fl. China. Science Press & Missouri Botanical Garden, Beijing, New York & St. Louis.

Notes (Last Modified On 3/27/2009)

general taxon notes:

Species of the Leskeaceae are widely distributed in temperate zones. They are usually epiphytic on tree trunks or growing on surfaces of rocks. There are different viewpoints about the family’s delimitation and its systematic positions. We basically adopted the system of Brotherus (1924) and P.-C. Chen et al. (1978). The genus Okamuraea is transferred from the Rhytidiaceae to this family. The Leskeaceae have a close affinity with the Thuidiaceae, but the species of the present family can be distinguished from the Thuidiaceae by the following features: 1) paraphyllia absent or few, unbranched, smooth; 2) leaf cells smooth or unipapillose; 3) capsules mostly erect, symmetric; 4) endostomes varying greatly among genera and cilia usually rudimentary, rarely well developed. Nine genera are recognized for the Leskeaceae in this treatment.

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1. Plants rigid; endostome evidently longer than the exostome...........................................9. Regmatodon

1. Plants mostly slender, delicate; endostome as long as the exostome or slightly shorter.........................2

2. Leaf costa single, ending below the midleaf or forked, rarely absent; leaf margins entire; leaf cells rounded, rounded ovate or shortly rhomboidal, smooth or mamillose............................ 7. Pseudoleskeella

2. Leaf costa single, reaching above midleaf; leaf margins serrulate; leaf cells rhomboidal, hexagonal or elongate- rhomboidal to nearly linear, mostly papillose or projecting at the upper ends, rarely smooth... 3

3. Endostome segments rudimentary or absent............................................................................4

3. Endostome segments relatively well developed............................................................................... 5

4. Plants small; leaves not plicate; leaf cells mostly rounded hexagonal or rhomboidal............. 4. Lindbergia

4. Plants rather large; leaves often plicate; leaf cells long rhomboidal........................................ 5. Okamuraea

5. Capsules inclined, not symmetrical; apophysis conspicuous; cilia well developed......... 8. Pseudoleskeopsis

5. Capsules erect, symmetrical; apophysis inconspicuous; cilia not rudimentary or absent......................6

6. Endostome segments irregularly shaped, not well developed...................................................7

6. Endostome segments regularly shaped, well developed....................................................................8

7. Plants rigid; leaves ovate-lanceolate, conspicuously plicate; leaf cells rounded hexagonal.......... 3. Leskeella

7. Plants delicate; leaves triangular-lanceolate, inconspicuously plicate; leaf cells long rhomboidal to nearly linear................................................................................................... 6. Orthoamblystegium

8. Dioicous; leaves acuminate at apex; leaf cells long rhomboidal or nearly linear, mostly projecting at the upper ends................................................................................................1. Lescuraea

8. Autoicous; leaves abruptly tapering to acute or acuminate at apex; leaf cells rounded to rounded hexagonal, smooth or papillose............................................................................................................ 2. Leskea