MICHIGAN ACADEMY OF SCIENCE. 
175 
eies have been noted in the latter place. It will thus be seen that only 
about one-third of the mainland species have been able to reach or main- 
tain themselves on the island. 
LIST OF SPECIES.* 
Pteris aquilina L. Common brake. — Common under trees and in open 
dry ground. Charity Island. 
Asplendum filix-foemina (L). Bernh. Lady fern.- — Occasional in 
damp shaded or open ground. Charity Island. 
Aspidium thelypteris (L.) Sw. Marsh sliield-fern. — Very common in 
damp shaded or open ground. Charity Island. 
Aspidium spinulosum (O. F. Miller) Sw. Spinulose shield-fern. — Fre- 
quent in rich shaded ground. Charity Island. 
Aspidium spinulosum, intermedium (Muhl.) D. C. Eaton. Spinulose 
shield-fern.— Occasional in damp rich shaded ground. Charity Island. 
Onoclea sensibilis L. Sensitive fern. — Very common in damp shaded 
or open ground. Charity Island. 
Osmunda regalis L. Flowering fern. — Occasional in shaded or open 
wet ground. Abundant in places. Charity Island. 
Osmunda cinnamomea L. Cinnamon fern. — Occasional in wet woods. 
Charity Island. 
Botrychium ternatum intermedium D. C. Eaton. Ternate grape-fern. 
— Occasional on dry ground. One specimen noticed near the lighthouse. 
Charity Island. 
Botrycium virginianum (L.) Sw. Rattlesnake fern. — Frequent in rich 
woods. Charity Island. 
Equisetum arvense L. Common horsetail. — Occasional in dry or damp 
ground. Charity Island. 
Equisetum sylvanticum L. Wood horsetail. — Frequent in damp 
shaded ground. Charity Island. 
Equisetum fluviatile L. Swamp horsetail. Pipes. — Occasional about 
the pond. Charity Island. 
Equisetum hyemale L. Scouring rush. — Occasional in light sandy 
ground. Charity Island. 
Equisetum hyemale intermedium A. A. Eaton. Scouring rush. — Fre- 
/ quent in dry shaded or open ground. 
Equisetum hyemale robustum (A. Br.). A. A. Eaton. Scouring rush. 
— Frequent in dry shaded ground. Charity Island. 
Equisetum varicgatum Schleicli. Variegated equisetum. — Frequent in 
sand along the beach. Charity Island. 
Lycopodium complanatum Li. Trailing christmas-green. — Occasional 
on dry shaded ground. Charity Island. 
Salaginella a, pus (L.) Spring. Creeping selaginella. — Frequent in 
damp grassy places. Charity Island. 
Finns strobus L. White pine. — Common but mostly small trees. Char- 
ity Island. 
Pinus banlcsiana Lamb. Jack pine. Gray pine. — One tree found on 
the west side. Charity Island, first noticed by N. A. Wood. 
♦Scientific names after.Gray’s New Manual of Botany. Many common names have been taken from 
Britton and Brown’s illustrated work. 
