Translator Disclaimer
1 October 2018 Spore Morphology and Wall Ultrastructure of Actinostachys Pennula (Sw.) Hook. and A. subtrijuga (Mart.) C. Presl. (Schizaeaceae)
Juan P. Ramos Giacosa, María C. Barakat
Author Affiliations +
Abstract

Actinostachys is a genus of the Schizaeaceae with two species reported from America: A. pennula and A. subtrijuga. The spores of the two species are studied using light microscopy, scanning electron microscopy and transmission electron microscopy. The spores are monolete, the equatorial diameter is 46–84 µm and the polar diameter is 26–50 µm. In A. pennula the ornamentation of the spores is foveolate and in A. subtrijuga it is striate, composed by parallel ridges separated by ornamented grooves. In both species, the exospore is two-layered and it is the wall that constitutes the ornamentation of the spores. The perispore is two-layered and thin with granules, and covers the outer surfaces of the exospore including the foveolae. On the spore surface of both species, abundant spheroids are observed. The ultrastructural analysis reveals that some of them are spherules and others globules. The studied species can be easily identified by their spores analysed with light microscopy even without prior treatment. We recommend that the spore ornamentation be included in dichotomous keys and descriptions of Actinostachys. The sporoderm ultrastructure of the species is described for the first time. The results contribute to the identification of the species and also may be valuable characters for systematic and phylogenetic purposes.

© 2018 AASP – The Palynological Society
Juan P. Ramos Giacosa and María C. Barakat "Spore Morphology and Wall Ultrastructure of Actinostachys Pennula (Sw.) Hook. and A. subtrijuga (Mart.) C. Presl. (Schizaeaceae)," Palynology 42(4), 483-491, (1 October 2018). https://doi.org/10.1080/01916122.2017.1413688
Published: 1 October 2018
JOURNAL ARTICLE
9 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

Share
SHARE
KEYWORDS
Actinostachys
morphology
Schizaeaceae
spores
ultrastructure
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top