NAME Fusidiporosporonites minutaestriatus
AGE Late Eocene-Middle Oligocene.   AGE span: 37.2...28.4 mya
K&J CLASSIFICATION (2000) Fungi Imperfecti, Amerosporae.
FIGURE(S)
Image of
Pl.2fig.16.jpg
FIGURE REFERENCE Song Z, Li G, Cao L, Luo H, Sun Z. 1989. Early Tertiary sporo-pollen assemblages from the Dongpu region; Edited by Research Institute of Exploration and Development, Zhongyuan Petroleum Exploration Bureau, Nanjing Institute of Geology and Palaeontology, Academia Sinica. 192 p.
SPECIES, AUTHORITY F. minutaestriatus Song, in Song Zhichen, Li Guangxing, Cao Liu, Luo Haicen & Sun Zihua 1989, p. 43, pl. 4, fig. 18.
LOCATION Shahejie Formation: Shenxian county of Shandong Province, China.
ORIG DESCRIPTION* Spores 48-58 x 14-18 µm, holotype 48 x 15 µm, spore wall 1 µm thick, ornamentation microstriate, striae less than 1 µm thick and tranversely arranged, distance between striae evenly narrow.
COMMENTS* This species can be distinguished from other species of Fusidiporosporonites by its characteristic narrowly fusiform shape, contracted to form a short tube at each terminal end. [However: only one species has been described in the genus.] The ornamentation and shape of the species is similar to that in Lacrimasporonites minutaestriatus (Early Tertiary palynology from the coast of the Bohai Sea [Ke & Shi, 1978], p. 42, pl. 4, fig. 13), but the latter has only one pore and one short terminal tube.
PUBLICATION REFERENCE Song Z, Li G, Cao L, Luo H, Sun Z. 1989. Early Tertiary sporo-pollen assemblages from the Dongpu region; Edited by Research Institute of Exploration and Development, Zhongyuan Petroleum Exploration Bureau, Nanjing Institute of Geology and Palaeontology, Academia Sinica. 192 p.
K&J REMARKS The illustrations are too closely cropped, and do not show whether or not the striae protrude on the outline [Jansonius & Hills (1990), card no. 4669]. Fusidiporosporonites minutaestriatus is characterized by numerous transverse, fine striae. Kalgutkar and Jansonius (2000) consider the presence of transverse microstriae to be a diagnostic feature that separates Fusidiporosporonites from Striadiporites, which is distinguished by longitudinal ridges (that may form a reticulum).

Kalgutkar and Jansonius (2000) maintain this genus as separate from Fusiformisporites on the basis of the transverse striation, and the more elongated terminal tubes. There is a suggestion in the photograph that there is a septum at the base of each of the tapered ends, more or less as occurs in Foveodiporites. However, these do not appear to form pore chambers (as no pores appear to be developed); also, the terminal regions are not darkly pigmented.
TYPE
ALL NAMES (Including synonyms) Fusidiporosporonites minutaestriatus
SERIAL NUMBER 610
PUBLIC COMMENTS
 *For source, see Publication Reference.