382 BICKNELL: FERNS AND 
who, in collecting it, are accustomed to keep it separate from the 
purple form for use, I was told, in making a light-colored jelly. 
On September 16, 1913, a group of plum gatherers returning across 
Chappaquiddick Island were laden with baskets of these plums, 
as many filled with the amber fruit as with the purple. I have 
likewise seen large sacks of the amber plums at Edgartown which, 
it was said, had been brought in from Chilmark. No constant 
difference in size or form between the yellow and purple fruit could 
be discovered, but on Chappaquiddick I observed a particular bush 
of the yellow-fruited form on which the plums were of unusually 
large size and ovoid rather than globose. The yellow fruit is 
somewhat translucent, and varies in color from amber to light 
yellow and pale orange. 
Laburnum vulgare Gris. Several well-grown trees of the la- 
burnum are scattered in partly open ground among the pines 
near Miacomet Pond, where they were in full bloom June 11, 19rt. 
Erodium cicutarium (L.) L’Hér, “A well-established colony of 
about twenty plants in a field near the Thorn lot,” in flower and 
fruit, September 15, 1915; specimens in the herbarium of Miss 
Grace Brown Gardner. Not reported as growing in Nantucket 
since 1851. 
Linum striatum Walt. Collected by Miss Gardner at Hum- 
mock Pond, September 12, 1915, the second known station on 
Nantucket. 
Cicuta bulbifera L. Collected by Miss Gardner, September, 
1915, at the original station discovered in 1899 by Mrs. Flynn. 
Arctostaphylos Uva-ursi (L.) Spreng. Mr. Floyd writes me 
that he has occasionally observed on the commons a form with 
crimson flowers, and that Mrs. Owen had told him that this 
crimson-flowered bearberry had been familiar to her for many 
years, 
AMSINCKLA ARENARIA Suksd. <A recent paper by Dr. J. 
Francis Macbride (A Revision of the North American Species of 
Amsinckia, Contr. Gray Herb. 49. 1917) makes clear that the 
plant reported in Part XIV of this series as A. intermedia F. & M. 
is not that species. Specimens have been submitted to Dr. 
