consensus trees/groups from clustering

Hi,
 I wish to build consensus groups/tree from a set of bootstraps from a
clustering algorithm such as hc or k-means, but can't find an R-function
that does this. Does anyone know of an R procedure/function which allows
one to build such consensus groups/tree .?

 Many thanks,
 Andrew


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Dr Andrew E Teschendorff
Hutchison/MRC Research Centre
Department of Oncology/Cancer Research UK
University of Cambridge
Hills Road
Cambridge
CB2 2XZ
UK

aet21 at cam.ac.uk    aet21 at hutchison-mrc.cam.ac.uk
07771 898256