Fabronia

Raddi

Atti Accad. Sci. Siena 9: 231, plate 1. 1808

Etymology: For Giovanni Valentino Mattia Fabbroni, 1752 – 1822, Italian naturalist
Treatment appears in FNA Volume 28. Treatment on page 477. Mentioned on page 442, 478, 655.
Stems prostrate. Leaves loosely appressed when dry, spreading when moist. Capsule ovoid to pyriform, [0.3–]0.5–0.8[–1] mm.

Distribution

North America, Mexico, West Indies, Central America, South America, Eurasia, Africa, Atlantic Islands, Pacific Islands (Hawaii, New Zealand), Australia.

Discussion

Species ca. 11 (2 in the flora).

Fabronia is characterized by its very small size, ovate to oblong-lanceolate, long-acuminate, usually toothed leaves tipped with linear cells, rhomboidal laminal cells, and relatively short costa. However, because of the wide degree of morphological variability, especially within the F. ciliaris complex, Fabronia is taxonomically difficult. Discussions of Fabronia by H. A. Crum and L. E. Anderson (1981) and W. R. Buck (1994b) are enlightening with respect to taxonomic problems.

References

None.

Lower Taxa

Key

1 Leaf apices acute or acuminate; margins dentate or sometimes entire, not ciliate, teeth of 1 cell. Fabronia ciliaris
1 Leaf apices acute to long-acuminate; margins ciliate-dentate, teeth often of more than 1 cell. Fabronia pusilla