Synonym: Collema subfurvum (Müll.Arg.) Degel.
Collema subflaccidum is a foliose jelly lichen, meaning that it becomes floppy-- a bit gelatinous-- when wet. It is dark black to olive or brownish when dry. There are globose isidia on the surface of the thallus. The photobiont is Nostoc, a cyanobacterium. Apparently C. subflaccidum is found mostly on trees, but can also be found on rocks and growing over moss.
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Collema subflaccidum (dry), photo Russ Kleinman & Karen Blisard, Gila NF, Little Cherry Creek Ranch Road growing on the moss Hedwigia ciliata on rock, November 21, 2024
Collema subflaccidum, photomicrograph of dry thallus with globose isidia, photo Russ Kleinman & Karen Blisard, Gila NF, Little Cherry Creek Ranch Road growing on the moss Hedwigia ciliata on rock, November 21, 2024
Collema subflaccidum, photomicrograph of dry thallus with globose isidia, photo Russ Kleinman & Karen Blisard, Gila NF, Little Cherry Creek Ranch Road growing on the moss Hedwigia ciliata on rock, November 21, 2024
Collema subflaccidum, photomicrograph of wetted thallus, photo Russ Kleinman & Karen Blisard, Gila NF, Little Cherry Creek Ranch Road growing on the moss Hedwigia ciliata on rock, November 21, 2024
Collema subflaccidum, photomicrograph of cross section of thallus with cyanobiont, photo Russ Kleinman & Karen Blisard, Gila NF, Little Cherry Creek Ranch Road growing on the moss Hedwigia ciliata on rock, November 21, 2024
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