Leiosporoceros
Leiosporoceros dussii is the only species in the hornwort genus Leiosporoceros. The species is placed in a separate family, order, and class for being "genetically and morphologically distinct from all other hornwort lineages."[3] Cladistic analysis of genetic data supports a position at the very base of the hornwort clade. Physical characteristics that distinguish the group include unusually small spores that are monolete and unornamented. Additionally, there are unique strands of Nostoc (cyanobacteria) that grow inside the plant parallel with its direction of growth. Male plants have been found in Panama.[1]
| Leiosporoceros | |
|---|---|
Scientific classification  | |
| Kingdom: | Plantae |
| Division: | Anthocerotophyta |
| Class: | Leiosporocerotopsida Stotler & Crand.-Stotl. emend Duff |
| Order: | Leiosporocerotales Hässel[1] |
| Family: | Leiosporocerotaceae Hässel[2] |
| Genus: | Leiosporoceros Hässel[2] |
| Species: | L. dussii |
| Binomial name | |
| Leiosporoceros dussii (Steph.) Hässel | |
| Synonyms | |
| |
The Ordovician fossil hornwort Casterlorum has been assigedn to this family as well
References
- Hässel de Menéndez, Gabriela G. (1988). "A proposal for a new classification of the genera within the Anthocerotophyta". Journal of the Hattori Botanical Laboratory. 64: 71–86.
- Hässel de Menéndez, Gabriela G. (1986). "Leiosporoceros Hässel n. gen. and Leiosporocerotaceae n. fam. of Anthocerotopsida". Journal of Bryology. 14: 255–259. doi:10.1179/jbr.1986.14.2.255.
- Duff, R. Joel; Juan Carlos Villarreal; D. Christine Cargill; Karen S. Renzaglia (2007). "Progress and challenges toward a phylogeny and classification of the hornworts". The Bryologist. 110 (2): 214–243. doi:10.1639/0007-2745(2007)110[214:PACTDA]2.0.CO;2.
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