@article{Keller_Marshall_2019, title={A new iridescent corticolous myxomycete species (Licea: Liceaceae: Liceales) and crystals on American elm tree bark in Texas, U.S.A.}, volume={13}, url={https://journals.brit.org/jbrit/article/view/793}, DOI={10.17348/jbrit.v13.i2.793}, abstractNote={<p>A <em>Licea</em> species new to science is described on the bark surface of living American elm (<em>Ulmus americana</em> L.) cultured in moist chambers. It is characterized by an iridescent peridium on the sides of the sporangium, a black apical circular patch of globular debris, and dark reddish black spores that are smooth over half the surface and ridged-reticulate over the other half with the paler thinner wall collapsing into a coffee-bean shape. This combination of morphological characters is distinct and separates this taxon from all other species of <em>Licea</em>. The history of moist chamber culture use and field collection of corticolous myxomycetes is reviewed. The discovery of crystals of unknown origin on the bark surface of American elms associated with <em>Licea</em> species are illustrated with light microscope photography and scanning electron microscopy. Light microscope images and habit photographs were made using multi-focus imaging and computer stacking to increase depth of field and provide illustrations in color of sporangial structures of the new <em>Licea</em> species. This tiny short-stalked <em>Licea</em> approximately 100 <em>u</em>m in height, and with distinctive external and internal morphological characters, was photographed using scanning electron microscopy. Dark-spored versus light-spored species of <em>Licea</em> are reviewed and compared with the most recent molecular analysis as this relates to the genus <em>Licea</em>. This paper is the first in a series that will document the discovery of <em>Licea</em> fruiting bodies of four new species on American elms in nature parks near Fort Worth, Texas.</p>}, number={2}, journal={Journal of the Botanical Research Institute of Texas}, author={Keller, Harold W. and Marshall, Vanessa M.}, year={2019}, month={Oct.}, pages={367–386} }