I am in the slow process of identifying 33 year old bryophyte (moss) samples from the TESC herbarium. I did two Racomitriums today. Racomitrium is tricky and the experts disagree so I try not to spend too much time banging my head over them. Here are some pictures of Codriophurus aciculare .
This one tricked me because I do not recognize cells like this to be pappilose. I honed on on Racomitrium aciculare right away in my field guide but kept dimissing it due to lack of pappilose cells. I love the online key to Oregon Racomitrium, in it I learned that these cells are pappilose, just not in a way that I recognize.