[Taxacom] Can anyone help to identify this?

[Virginia Bianchinotti]

Dear Taxacomers
Does anybody have any idea? it appeared in samples of an archaeological profile in Argentina

Thanks in advance

Virginia
Dra. María Virginia Bianchinotti

Laboratorio de Estudios Básicos y Biotecnológicos en Algas y Hongos (LEBBAH)
CERZOS-CONICET
Edificio E-1, CRIBABB (CONICET) - 
Camino La Carrindanga, Km 7. 
Tel: 54 (0291) 4861124, Fax: 54 (0291) 4861527 
8000 - Bahía Blanca. 
ARGENTINA