Abstract—

An ultramicroscopic study of tubiphytes—tubular formations, composed of pelitomorphic calcite from the Lower Permian Tra-Tau reef (Cis-Urals)—was carried out. A multilayer structure of the walls was recognized. The inner layer is an ultrathin layer of acicular calcite crystals, which often has aragonite habit; the next layer is a relatively thick one represented by a dense pelitomorphic mass, which is often encrusted with the calcite crystals. Between the first and second layers are traces of mineralized biofilms, “lace” secretions of mineralized glycocalyx. It is assumed the inner layer is the tubiphyte wall and the pelitomorphic one is the result of biochemogenic carbonate precipitation as a consequence of ability of epiphytic bacterial activity, which colonized the walls of an original organism. A relatively high C/Ca ratio in the glycocalyx relics, its consequent decrease from the acicular wall towards the pelitomorphic one, and finally to the purely chemogenic crystalline formations of crustified rims is an indirect proof of such a formation mechanism of tubiphytes.

中文翻译：

---

土生植物壁的超微结构

摘要-

进行了微管植物的超微显微镜研究，该微管植物是由下二叠纪Tra-Tau礁（Cis-Urals）的贝托方解石组成的管状结构。识别出壁的多层结构。内层是针状方解石晶体的超薄层，通常具有文石习性。下一层是相对较厚的一层，以致密的块状块体为代表，通常被方解石晶体包裹。在第一层和第二层之间是矿化生物膜的痕迹，矿化糖萼的“蕾丝”分泌物。假定内层是管状植物壁，而拟形的是由于附生细菌活动能力的结果而生化的碳酸盐沉淀的结果，而附生细菌的活动则定居在原始生物体的壁上。