page_title: Isidium
hierarchical_section_title: Isidium
caption_attribution_description: Leptogium cyanescens (Rabenh.) Körber, 1855 (photograph of a herbarium specimen taken through a dissecting microscope (x40) showing isidia that are lobule-like) Growing with moss over granite outcrops along east side of the Upper S Branch Pond, at Baxter State Park, Piscataquis County, Maine, USA; collected and identified by A. Norden and B. Norden (No. 7724, 9 Jun 1974); specimen is now in the Lichen Herbarium of the New York Botanical Garden.
context_page_description: An isidium is a vegetative reproductive structure present in some lichens. Isidia are outgrowths of the thallus surface, and are corticated, usually with a columnar structure, and consisting of both fungal hyphae and algal cells. They are fragile structures and may break off and be distributed by wind, animals, and splashing raindrops. In terms of structure, isidia may be described as warty, cylindrical, clavate, scale-like, coralloid, simple, or branched.
  Examples of isidiate lichens include members of the genera Parmotrema and Peltigera.
context_section_description: An isidium is a vegetative reproductive structure present in some lichens. Isidia are outgrowths of the thallus surface, and are corticated (i.e., containing the outermost layer of the thallus), usually with a columnar structure, and consisting of both fungal hyphae (the mycobiont) and algal cells (the photobiont). They are fragile structures and may break off and be distributed by wind, animals, and splashing raindrops. In terms of structure, isidia may be described as warty, cylindrical, clavate (club-shaped), scale-like, coralloid (coral-shaped), simple, or branched.
  Examples of isidiate lichens include members of the genera Parmotrema and Peltigera.
caption: A herbarium specimen of the lichen Leptogium cyanescens, magnifed 40X, with lobule-shaped isidia.
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