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Arroyo de Piedra is a pre-Columbian Maya archaeological site in Guatemala located approximately 2-3 km east/northeast of Dos Pilas and 3 km west of Tamarindito. The site dates to the middle half of the Classic period. While initially a center of some regional importance, with the rise of Dos Pilas, Arroyo de Piedra was subsumed as a secondary center within the Petexbatun region.
The architecture of Arroyo de Piedra is different from that of Dos Pilas and nearby Aguateca, but bears similarities to Tamarindito. Hieroglyphic data shows that together Arroyo de Piedra and Tamarindito formed an independent polity prior to the establishment of Dos Pilas by Tikal. It appears that Arroyo de Piedra was abandoned during the 8th century following the collapse of Dos Pilas and the disintegration of the polity centered there.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction