Adinosporus

Adinosporus ? sp.

Text-figs 8a–d, 9a, b

Specimen R10 is a clump of 40 or more packets, each approximately 30 µm in diameter ( Text-fig. 8a). When viewed in TEM cross-section ( Text-fig. 8b, c, d), the packets consist of multiple spore-bodies with highly compressed walls that are approximately 1.5–2.0 µm thick. The former lumen can be difficult to identify with certainty, but based on the symmetry of the surrounding laminar zones, an approximation can be made (marked with an arrow on Text-fig. 8 and Text-fig. 9).

The outer half of the wall is densely constructed with hints of lamination throughout and some more lightly staining voids

( Text-fig. 8c, d). The inner half consists of multiple continuous laminae of variable construction. Few if any of the individual laminae are of consistent thickness along their length. There are several types of laminar construction present: Type 1 laminae are approximately 100 nm thick, smooth on the inside, but with an undulating surface on the outside (labeled “1” on Text-fig. 9a, b).

Type 2 laminae occur as thicker units (up to 200 nm) that undulate on both the inside and the outside surface (labeled “2” on Text-fig. 9a, b).

Type 3 laminae are found in zones of alternating thick and very thin laminae (labeled “3” on Text-fig. 9a, b).

Type 4 laminae consist mostly of beads connected by zones of very thin laminae (labeled “4” on Text-fig. 8c, d).

Other extraneous fragments of wall material (beads, laminae, etc.) also occur throughout the wall but are difficult to track to individual laminar zones.

Some laminar zones also have a concentration of lightly staining circular to elliptical voids within (marked with an asterisk on Text-fig. 8c, d and Text-fig. 9a, b).