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Structural evidence of diffuse growth and parenchymatous cell division in the cortex of the umbilicate lichen Lasallia pustulata

Published online by Cambridge University Press:  26 September 2018

William B. SANDERS  and
Asunción DE LOS RíOS
William B. SANDERS
Affiliation:
Department of Biological Sciences, Florida Gulf Coast University, 10501 FGCU Blvd, Ft. Myers, Florida 33965-6565, USA. Email: wsanders@fgcu.edu
Asunción DE LOS RíOS
Affiliation:
Departamento de Biogeoquímica y Ecología Microbiana, Museo Nacional de Ciencias Naturales (CSIC), Serrano 115 dpdo, Madrid 28006, Spain
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Abstract

How growth is distributed within the morphologically diverse thalli of lichens is still poorly known and the anatomical mechanisms involved are not well understood. This work applies electron microscopy (SEM and TEM) to examine cell- and tissue-level events in the umbilicate thallus of Lasallia pustulata, whose pattern of expansion was the subject of a previous field study. Stacks of epinecral tissue accumulating at the thallus surface showed broadening bases and recurring rupture attributable to diffuse expansion of the living tissue below. Cortical cells, dividing anticlinally, adjoined septa to previous septa, indicating parenchymatous divisions. These observations are all consistent with previous contentions that mature, organized tissues within the thallus are capable of continued diffuse growth. They provide a developmental explanation for the morphology of the epinecral layer and suggest that anatomical characteristics may be helpful in recognizing diffuse growth patterns. Parenchymatous cell divisions, believed until recently to never occur in lichen thallus tissues, are shown to play a developmental role in the diffuse growth of the umbilicate lichen thallus.

Keywords

anatomyepinecral layerhistogenetic processesmorphogenetic processessepta
Type
Articles
Information
The Lichenologist , Volume 50 , Issue 5 , September 2018 , pp. 583 - 590
Copyright
© British Lichen Society, 2018 

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