Abstract
Una comparación del desarrollo del gametofito de Phlebodium araneosum, P. pseudoaureum y P. decumanum fue hecha. Las esporas fueron sembradas en agar con sales minerales. Similitudes en el tipo de germinación y desarrollo protálico fueron observadas. Los gametofitos adultos fueron cordiforme-espatulados a cordiforme-reniformes; losgametangios son del tipo común de los helechos Ieptosporangiados. Las tres especies muestran caracteristicas morfogenéticas del gametofito similares y no añaden caracteristicass adicionales que apoyen la distinción entre Phlebodium, Polypodium, Microgramma y Niphidium, por lo que se refiere a la fase sexual.
Highlights
Phlebodium differs from areolated species cal epiphytic plant on palms,at altitudes from of Po(ypodium by the sori occurring on the ". 200 to 500 m (Mickel andBeitel '1988).The junction of double included veins in the are,'. , morphologiciU characteristics distinguishing the
A comparison was made of the gametophytic deve10pment of Phlebodium araneosum, P. pseudoau reum and P. decumanum
AlI three species share similar morphogenetic features of the gametophytes, and these do not 1end additional characteristics to support the distinction of Phlebodium from Polypodium, Microgramma and Niphidium, as regard the sexual phase
Summary
Spores were collected from different indi viduals at the localities shown in table 1. Allthree species exhibited a Vittaria-type ger mination pattern (Nayar and Kaur 197 1) with refracting globules in the fírst prothallial cells The spore wall was still attached to the basal cell and there were one to three rhizoids present Within 40-60 days, the meristematic cell develops into an apical pluri cellular meristem centrally located All three species exhibit a Drynaria-type· prothallial development (Nayar and Kaur 1969,197 1) At this stage, the prothalli of all three species show uniceUular and capitate trichomes locat ed on the margins and surface Differentiation of the antheridia in the three species takes place on the surface of a protruding cell already described for other polypodiaéeous fems (Nayar and Kaur 1971) which is responsible for their pendulous shape. Stomata are anomocytic (Van Cotthem 1973), with two occlusive cells surrounded by epidermal cells with wavy lateral walls (Fig. 29), and are present on the abaxial surface of the lamina, but absent on the adaxi al surface
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