Status: Native
Synonyms:
Dicranum starkei F. Weber & D. Mohr
Dicranum curvifolium Schleich. ex DC.
Arctoa starkei looks like a Dicranum by habit. The best character by which to differentiate
it from that genus is by a cross section of the costa. The costa of Arctoa starkei lacks
well-differentiated stereid cells. The capsule is ribbed when dry and is indistinctly
strumose at the base (looks like it has a small swelling). The operculum is obliquely long rostrate.
Many thanks to the University of Colorado Herbarium (COLO), Erin Tripp, & Dina Clark for permitting us
to photograph this specimen!
Please click on an image for a larger file.
Arctoa starkei, (dry habit) collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, dark field photomicrograph of moistened stem, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of leaf, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of leaf apex, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of leaf base, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of leaf base, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of cells at midleaf, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of capsule, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of leaf cross section, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
Arctoa starkei, photomicrograph of leaf cross section, collection and ID by Holmes Rolston III (verified by F.J. Hermann), Colorado, Eagle County, White River National Forest, White River, Missouri Creek above Diversion Dam, July 25, 1984; photos by Russ Kleinman & Karen Blisard, March 3, 2023
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