How to recognize Trematodon longicollis: This moss grows in very similar places to its sister species Trematodon ambiguus which is also autoicous (with male and female sex organs on the same plant), and often found with sporophytes.. This moss differs mainly from its sister, T. ambiguus, by the very long neck which is twice as long as the urn (spore producing capsule). The neck of the sporophyte of T. ambiguus is only about as long as the urn. The 2-3 mm leaves are oblong to oblong-ovate at the clasping base, then gradually linear-subulate above. The single midrib extends into the blunt-toothed leaf tip.
Where to find Trematodon longicollis: Look for this moss on damp soil along roadsides, fields or gravel pits, and bare soil at the base of trees.