Rectangular, paper envelope containing specimen photographs and/or negatives that has typed notes describing: the scientific name of the specimen at the Family, Genus and species level; Carlquist’s collector number; location details; botanical details; and photography scale (close-up, ultra close-up). The envelope’s opening flap is on the back along the short side and there are signs of minor wear at the corners. A photograph of the specimen is affixed to the front.
Sherwin Carlquist (1966) studied this question.