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Annals of Botany 41: 1055-1060, 1977
© 1977 Annals of Botany Company

RESEARCH-ARTICLE

Mating Systems and Distribution in some Tropical Ferns

V. P. SINGH and S. K. ROY

Department of Botany, Banaras Hindu University Varanasi-221005, India

Received: 27 July 1976    Returned for revision: 13 December 1976   

Applying mating system genetics as the tool, three tropical ferns, namely, Ceratopteris thalictroides, Pseudodrynaria coronans and Pityrogramma calomelanos were examined for their distributional patterns. Absence of recessive lethals in the sporophytes of P. colomelanos allows its spores to function as a single propagule in the colonization of open habitats through intra-gametophytic selfing and it is widely distributed. The phenomenon of leaky lethality and ultimately recessive sporophytic lethality in P. coronans is associated with a restricted distribution of the species in the forest. Ecological specialization in the case of C. thalictroides also renders it a poor colonizer though its mating system is directed towards intergemetophytic selfing with capacity in time for intra-gametophytic selfing.


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