Fissidens exilis

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Identification notes

This is arguably our smallest species of Fissidens and although its massed capsules are conspicuous in the winter through to spring, they almost look like they are growing from the ground itself.

It loves clayey ground – the heavier the better – and shade too. Although it is definitely one of the more distinctive of our Fissidens species, it is usually so small that microscopic examination is needed to confirm its diagnostic characters.

The main thing to check first is whether its leaves have a border of narrow, elongated cells. It is one of only two very small Fissidens that grow on soil that lacks such a border; the other is F. celticus, which usually also has a bent nerve. But that species has numerous pairs of leaves whilst another useful field character for F. exilis is that it has very few pairs of leaves. Other very small terricolous Fissidens, such as F. viridulus and F. incurvus, always have at least partially bordered leaves.

Read the Field Guide account

Distribution in Great Britain and Ireland

View distribution from the BBS Atlas 2014

Resources you may find useful

Pilkington, S. 2015. Fissidens: a few shortcuts. Field Bryology 113: 40-43

This Beginners Corner article focusses on some of the main difference between the more common Fissidens species.

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