INVESTIGADORES
GARCIA MASSINI juan Leandro
congresos y reuniones científicas
Título:
Fungi with affinities to the Glomales in the Permian of Antarctica
Autor/es:
GARCÍA MASSINI, J.L., TAYLOR, T.N.
Lugar:
Mobile, Alabama, USA
Reunión:
Congreso; 97th Botanical Society of America meeting; 2003
Resumen:
Abstract Two compact clusters of terminar and intercalary chlamydospores occur in decaying remnants of silicified tissue from the Permian of Antarctica. Chlamydospores are pyriform to subglobose, and sometimes broadly triangular. Most posses two pores, each located at the opposite end of the spore. In some spores three or four pores are present and these are also symmetrically arranged. Pores vary in size (2.5-18 µm), and maybe circular to slightly elliptical. Some posses a slightly thickened rim along the edge of the pore. A few spores appear to have been terminal and are attached to nonseptate, subtending hyphae. In approximately half of the chlamydospores the spore wall consists of three layers; the outer is thick and laminated, the middle is non laminated and tightly appressed to the outer wall, and the inner is of a membranous appearance and sometimes dettached an wrinkled in the center of the spore. The outer wall of the chlamydospore as well as the subtending hyphae appears to be ornamented with small protuberances sometimes resulting in a slightly reticulate pattern; however, since specimens with psilate walls are also present, the ornamentation observed could be the result of diagenetic processes. Morphologically these fossils resemble extant and fossil members of the Glomales. The presence of ornamented terminal and intercalary clusters of chlamydospores with an elaborated spore wall structure are characteristics seen in the genus Glomus within the family Glomaceae. This report constitutes the first Glomus-like fungi known from the Permian, and points to the importance these fungi have had since their first appearance in Ordovician times in shaping terrestrial ecosystems.