Anatomy of the sporophyte of Doryopteris concolor (Langsd. & Fisch) Kuhn (Pteridaceae).

HERNANDEZ, MARCELA; BENAVÍDEZ, ANALÍA; TERAN, GUILLERMO

Tafi del Valle

Congreso; XXIV Jornadas Científicas. Asociación de Biología de Tucumán.; 2007

Asociación de Biologia de Tucumán

D. concolor (Langsd & Fisch) Kuhn is a fern that is found from Central America to NW Argentina between 400 and 1600 meters above sea level. This plant has pedate fronds, with interrupted marginal sori, dark petiole and compact rhizome. This work analyzes its anatomy. Conventional anatomical techniques were applied. Stomatic Index, trichome index, stomata and trichome size were calculated for 23 individuals with 5 repetitions. Both epidermises present rectangular cells with lobated walls. Hipostomatic leaves with polocytic and actinocytic stomata of 36.62 ìm x 29 ìm. The mesophyll has 2 layers of palisade and 3-4 layers of spongy parenchyma. Protostelic vascular bundle surrounded by endodermis. Stomatic index, 9.77. Glandular trichomes, 67.5 ìm, with unicellular foot and head, trichome index 2.49. Lobulated reflex margin. Subcircular petiole with glandular trichomes in the dorsal part. Sclerenchymatic epidermis and subepidermis, protostelic vascular bundle with V-shaped xylem, pericicle and endodermis. Solenostelic rhizome covered by scales, pith and cortex formed by esclereids, meristeles with endodermis. Adventitious roots with primary diarch structure. The anatomy of this species is described for the first time. The characters of diagnostic value are: type of trichomes, stomata, steles, and the amount of esclerenchymatic tissue.