Hieracium uistense on Canna and Cystopteris diaphana on Skye

A hawkweed collected by Michael Usher on Canna earlier in the year has been determined as Hieracium uistense (Island Hawkweed).  Known from several sites on Skye and with older records from Guillemon Island (near Scalpay) and Rum, this is the first recent record and the first from Canna.

Christopher Fraser Jenkins has been at RBGE and has had another look at one of his 1988 collections from Struan  which he seems quite sure is C. diaphana (Diaphanous or Greenish Bladder-fern). According to Murphy & Rumsey (Watsonia 25: 255–263 (2005)) this plant was first recorded in the British Isles in 2000 from Cornwall and then identified from several localities in the south-west of England.  Since that publication some older records have been added to the BSBI Database, but from the information given there it is unclear whether the records for NW Wales and southern Ireland are escapes from cultivation.

“Struan” is a pretty vague location but the plant is wintergreen and judging from the known localities, likely to be at low altitudes and perhaps along a river in damp shaded habitat.  The vein endings seem to be a good character to look for ending in the notches of the lobes on toothed leaves, not into the lobes themselves.

I am away at present and again for Christmas, New Year and some time afterwards but this has to be worth a try…..


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: