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Know trees in winter - grey alder

09.01.2010 - 02:11 |  Looduskalender
Photo: Arne Ader
Translation: Liis
 
Bullfinch in grey alder.
 
It is easy to recognise alders when you know that the cones and male catkins of the alder show clearly in midwinter. But it is worth noting that besides the grey alder (Alnus incana) the black or common alder (Alnus glutinosa) also grows here, as well as their hybrid, (Alnus x pubescens) that however is rather rare. In the forest one mainly has to know the grey alder from the black alder: when the leaves have fallen then look at the “cones” (they are not really proper cones such as conifers have, but seedheads that develop from the female catkins and have nutlets inside). The cones of the grey alder have practically no stalks, on the black alder they  hang from twiggy stalks.
In Arne’s photo the bullfinch sits in a grey alder, although it is difficult to determine the length of the cone stalks here. In the forest it is easy!

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