INVESTIGADORES
GARCIA MASSINI juan Leandro
artículos
Título:
Millerocaulis zamunerae sp. nov. (Osmundaceae) from Jurassic, geothermally influenced, wetland environments of Patagonia, Argentina
Autor/es:
SAGASTI A.J.; GARCIA MASSINI J.L.; ESCAPA I.E.; D. M. GUIDO; A. CHANNING
Revista:
ALCHERINGA
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: Londres; Año: 2016 vol. 40 p. 456 - 474
ISSN:
0311-5518
Resumen:
A new species of Millerocaulis Erasmus ex. Tidwell emend. Vera is defined based on several permineralized stems recovered from geothermallyinfluenced chert deposits in the Middle?Late Jurassic La Matilde Formation (Santa Cruz, Argentina). Millerocaulis zamunerae sp. nov. is characterizedby the presence of an ectophloic dictyoxylic siphonostele, inner parenchymatic and outer sclerotic cortices, homogeneous sclerotic ring in thepetiole bases, two masses of sclerenchyma lining the concavity of the petiolar vascular bundle, petiolar inner cortex with sclerenchyma strands inthe outermost petiole cycles and stipular wings having one large and several smaller sclerenchyma bundles. Millerocaulis zamunerae inhabitedgeothermal wetlands and other hot-spring-related sedimentary facies associated with the La Bajada epithermal deposit. Reference to active geothermalwetlands, analogous living plants and other fossil hot spring ecosystems suggest the plant?s tolerance of physico-chemical stressors includingelevated temperature, pH, salinity and phytotoxic metals/metalloids. Millerocaulis zamunerae thrived in wetlands preserved in the Jurassic geothermalsystems of Santa Cruz Province, the same kind of environment in which Equisetum thermale Channing et al. was recorded previously.