A new iridescent corticolous myxomycete species (Licea: Liceaceae: Liceales) and crystals on American elm tree bark in Texas, U.S.A.
DOI:
https://doi.org/10.17348/jbrit.v13.i2.793Keywords:
fruiting bodies, moist chamber cultures, multi-focus imaging, peridium, plasmodial slime molds, scanning electron microscopy, sporangia, spores, software stackingAbstract
A Licea species new to science is described on the bark surface of living American elm (Ulmus americana 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 Licea. 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 Licea 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 Licea species. This tiny short-stalked Licea approximately 100 um in height, and with distinctive external and internal morphological characters, was photographed using scanning electron microscopy. Dark-spored versus light-spored species of Licea are reviewed and compared with the most recent molecular analysis as this relates to the genus Licea. This paper is the first in a series that will document the discovery of Licea fruiting bodies of four new species on American elms in nature parks near Fort Worth, Texas.
References
Braun, K.L. & H.W. Keller. 1977. The collection of plasmodial slime molds as a winter hobby. McIlvainea 3(1):18–20.
Brooks, T.E. 1967. A study of corticolous myxomycetes. Ph.D. Dissertation. University of Kansas,Lawrence, Kansas, U.S.A.
Burns, R.M. & B.M. Honkala. 1990. Silvics of North America, Vol. 2, Hardwoods, Agriculture Handbook 654. Forest Service, United States Department of Agriculture, Washington, D.C., U.S.A. Pp. 801–807.
Dmitry, V.L., M. Schnittler, S.L. Stephenson, Y.K. Novozhilov, & O.N. Shchepin. 2019. Towards a phylogenetic classification of the myxomycetes. Phytotaxa 399(3):209–238.
Eliasson, U.H. 2015. Review and remarks on current generic delimitations in the myxomycetes, with special emphasis on Licea, Listerella and Perichaena. Nova Hedwigia 104(1):343–350.
Everhart, S.E. & H.W. Keller. 2008. Life history strategies of corticolous myxomycetes: The life cycle, fruiting bodies, plasmodial types, and taxonomic orders. Fungal Diversity 29:1–16.
Everhart, S.E., H.W. Keller, & J.S. Ely. 2008. Influence of bark pH on the occurrence and distribution of tree canopy myxomycete species. Mycologia 100:191–204.
Everhart, S.E., J.S. Ely, & H.W. Keller. 2009. Evaluation of tree canopy epiphytes and bark characteristics associated with the presence of corticolous myxomycetes. Botany 87:509–517.
Fiore-Donno, A.M., F. Clissmann, M. Meyer, M. Schnittler, & T. Cavalier-Smith. 2013. Two-gene phylogeny of bright-spored myxomycetes (slime moulds, Superorder Lucisporidia). PLOS ONE 8(5):1–12.
Gilbert, H.C. & G.W. Martin. 1933. Myxomycetes found on the bark of living trees. Stud. Nat. Hist. Iowa Univ. 15(3):3–8. Gilbert, H.C. 1934. Three new species of myxomycetes. Stud. Nat. Hist. Iowa Univ. 16:153–159.
Ing, B. & R. McHugh. 1988. A revision of Irish myxomycetes. Proc. Roy. Acad. Sci., Sect. B. 88(7):99–117.
Keller, H.W. 1979. Travis E. Brooks 1917–1976. Mycologia 71:233–237.
Keller, H.W. 1980. Corticolous myxomycetes VIII: Trabrooksia, a new genus. Mycologia 72:395–403.
Keller, H.W. 2004. Tree canopy biodiversity: Student research experiences in Great Smoky Mountains National Park. Syst. Geogr. Pl. 74:47-65.
Keller, H.W. 2011. Tales from past forays; importance of habitats. Earthstar Examiner 102 (March):6–7.
Keller, H.W. 2012. Myxomycete history and taxonomy: Highlights from the past, present, and future. Mycotaxon 122:369–387.
Keller, H.W. & K.M. Barfield. 2017. The Great Smoky Mountains National Park: The People’s Park. Fungi 10(2):44–64.
Keller, H.W. & K.L. Braun. 1999. Myxomycetes of Ohio: Their systematics, biology and use in teaching. Bull. Ohio Biol. Surv. 13(2):1–182.
Keller, H.W. & T.E. Brooks. 1973. Corticolous myxomycetes I: Two new species of Didymium. Mycologia 65:286–294.
Keller, H.W. & T.E. Brooks. 1975. Corticolous myxomycetes III: A new species of Badhamia. Mycologia 67:1218–1222.
Keller, H.W. & T.E. Brooks. 1976a. Corticolous myxomycetes IV: Badhamiopsis, a new genus for Badhamia ainoae. Mycologia 68:834–841.
Keller, H.W. & T.E. Brooks. 1976b. Corticolous myxomycetes V: Observations on the genus Echinostelium. Mycologia 68:1204–1220.
Keller, H.W. & T.E. Brooks. 1977. Corticolous myxomycetes VII: Contribution toward a monograph of Licea, five new species. Mycologia 69:667–684.
Keller, H.W., T.E. Brooks, & M. Chassain. 1977. Corticolous myxomycetes VI: A new species of Diderma. Mycologia 69:179–184.
Keller, H.W., S.E. Everhart, M. Skrabal, & C.M. Kilgore. 2009. Tree canopy biodiversity in temperate forests: Exploring islands in the sky. S.E. Biol. 56(1):52–74.
Keller, H.W. & S.E. Everhart. 2010. Importance of myxomycetes in biological research and teaching. Fungi 3(1):29–43.
Keller, H.W., S.E. Everhart, & C.M. Kilgore. 2017. The myxomycetes: Introduction, basic biology, life cycles, genetics, and reproduction. In: Stephenson, S.L. & C. Rojas, eds. Myxomycetes: Biology, systematics, biogeography and ecology. Academic Press, London, UK. Pp. 1–40.
Keller, H.W., C.M. Kilgore, S.E. Everhart, G.J. Carmack, C.D. Crabtree, & A.R. Scarborough. 2008. Myxomycete plasmodia and fruiting bodies: unusual occurrences and user-friendly study techniques. Fungi 1(1):24–37.
Keller, H.W., M. Skrabal, U.H. Eliasson, & T.W. Gaither. 2004. Tree canopy biodiversity in the Great Smoky Mountains National Park: Ecological and developmental observations of a new myxomycete species of Diachea. Mycologia 96:537–547.
Kilgore, C.M., H.W. Keller, & J.S. Ely. 2009. Aerial reproductive structures on vascular plants as a microhabitat for myxomycetes. Mycologia 101:303–317.
Kilgore, C.M., H.W. Keller, S.E. Everhart, A.R. Scarborough, K.L. Snell, M.S. Skrabal, C. Pottorff, & J.S. Ely. 2008. Research and student experiences using the doubled rope climbing method. J. Bot. Res. Inst. Texas 2(2):1309–1336.
Lado, C. 2005–2019. An online nomenclatural information system of Eumycetozoa. Real Jardín Botánico, CSIC. Madrid, Spain, last consulted, 28 May 2019.
Lado, C. & U. Eliasson. 2017. Taxonomy and systematics: Current knowledge and approaches on the taxonomic treatment of myxomycetes. In: Stephenson, S.L. & C. Rojas, eds. Myxomycetes: Biology, systematics, biogeography and ecology. Academic Press, London, UK. Pp. 205–251.
Marshall, V.M. & H.W. Keller. 2018. Myxomycetes on American elms surviving Dutch elm disease in Texas. Texas Plant Conservation Conference. Abstract Volume. P. 19. Fort Worth, Texas, U.S.A.
Martin, G.W. & C.J. Alexopoulos. 1969. The myxomycetes. Univ. of Iowa Press, Iowa City, U.S.A.
Mitchell, D.W. & R. McHugh. 2000. Recent discoveries of corticolous Licea species from the British Isles with descriptions of two new species. Karstenia 40:103–109.
Novozhilov, Y.K., H., van Hooff & M. Jagers. 2015. Trichioides iridescens, a new genus and new species (incertae sedis in Myxomycetes). Myco. Prog. 14:1018.
Poulain, M., M. Meyer, & M. Bozonnet. 2011. Les Myxomycetes. Fédération Mycologique et Botanique Daujphiné-Savoie, Sevrier, France. Vols. 1 & 2.
Scarborough, A.R., H.W. Keller, & J.S. Ely. 2009. Species assemblages of tree canopy myxomycetes related to pH. Castanea 74(2):93–104.
Snell, K.L. & H.W. Keller. 2003. Vertical distribution and assemblages of corticolous myxomycetes on five tree species in the Great Smoky Mountains National Park. Mycologia 95:565–576.
Sundb erg, W.J. & H.W. Keller. 1996. Myxomycetes: Some tools and tips on collection, care, and use of specimens. Inoculum 47(4):12–14.
Wrigley de Basanta, D., T.W. Ko Ko, W.C. Rosing, & S.L. Stephenson. 2017. Licea metallica, a new myxomycete from Laos. Nova Hedwigia 104(1–3):237–242.
