Boy that was quick!  I've been awaiting a reply from the herbarium to confirm a change in submission protocol before I changed it on this site.  You may or may not hear back from Dr. Arnold on this as she doesn't handle the submissions anymore.  They are handled by the assistant curator.  I hope to hear back from him today.

You're welcome Mike. Also see the link "assisting members with the collection of specimens" on the lower right hand corner of the home pages to a voucher (which Laurie made fillable) with some vouchering guidelines that suggest linking the voucher to a www.mushroomobserver.org (MO) observation by using the MO observation number as your collection number which will appear in the herbarium record as the secondary catalog number.  This gives the herbarium a link to digital photos and field notes on the MO observation.

Dr. Betsy Arnold, curator of the Gilbertson Herbarium gave us the following guidelines for collecting for the herbarium:  1) Collect carefully by digging up the entire mushroom(s), in a few stages of maturity if possible, multiple specimens if possible, bag the specimen(s) separately from other mushrooms in a labeled paper or wax paper bag, keep cool and dry;  2)  Preserve properly by cutting a least one mushroom in half longitudinally, dehydrating at 110 degrees or less until brittle, keeping specimens free of moisture after drying; and  3) Photograph mushrooms and record  important data at the time of collection such as date collected,locality, elevation, growing on ground or wood, types of trees within 20 meters, distinctive odors, bruising etc.  Submit specimens to the herbarium with a voucher that provides the following information:  Scientific name, Family, Collector, Determiner, Date Collected, Locality (eg. USA, Arizona, Coconino Nat. Forest, SR 180), Habitat, Notes.