terrycrynant's picture

2mm to 3mm leaf

Observed: 14th May 2011 By: terrycrynantterrycrynant’s reputation in Plantsterrycrynant’s reputation in Plantsterrycrynant’s reputation in Plants
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2mm to 3mm leaves growing on old tree stump in damp wood.

Species interactions

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Chalkie's picture

Not saying you're wrong, just asking!

What makes it Rhizomnium and not a Plagiomnium? (I thought that the nerves went right to the tip of the leaves, which is why I opted for Plagiomnium, but it's a long time since I really looked at mosses.)

TimP's picture


I'm only going by they keys in the BBS field guide! The shape of the leaf and the untoothed margin makes it key out quite easily

Chalkie's picture


I admit I didn't use the key, I went to Mnium first, from a gut-response from a moss course many years ago, and checked nearby pictures - not very scientific I admit! But looking at the pictures, Plagiomnium rostratum (which is also untoothed) looks a slightly better fit - what do you think? The veins go right to the end of the leaves.

TimP's picture


Revisiting the key, I see Plagiomniums can key out with untoothed leaves, if the stems are creeping. That's not clear from your pictures, but I'm now thinking things aren't as straight forward as I first thought. I'm not familiar with P. rostratum, but I would say in my defence that when I have seen Rhizomnium punctatum it does very much look like what you've photographed (for what that's worth!)