202 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
var. megastachyon Fernald & Bissell. — Spikes solitary. ( Vid. 
Rhodora, 12: 53, 1910.) 
Dry thickets; frequent, especially on the upland. 
L. complanatum L., var. flabelliforme Fernald. Ground 
Pine. — (L. complanatum 111. Fl. ed. 2 in part.) 
Dry woods and clearings, especially under pines; common. 
L. inundatum L. — Shores of ponds and wet open ground; occa- 
sional. Bank near cold stream, altitude 2000 feet. North Adams 
(Andrews); Basin and Spectacle Ponds, Becket; low meadow, 
Sheffield. 
L. lucidulum Michx. — Cool woods; common. 
L. obscurum L. Tree Club Moss. — Woods, generally dry, 
occasionally swampy; frequent. 
var. dendroideum (Michx.) D. C. Eaton. — Open woodlands; 
common. 
L. Selago L. Bank near cold stream on the northeast face of Grey- 
lock, altitude 2000 feet, one small station (Andrews). This is the only 
station known in Massachusetts for this plant of high latitudes and 
altitudes. Specimen in Williams College Herbarium. 
L. tristachyum Pursh. — Cheshire (Winslow) ; rather moist woods 
near Ward Pond, Becket, altitude 1600 feet; dry woods, Sheffield. 
SELAGINELLACEAE. 
SELAGINELLA. 
S. apoda (L.) Fernald.— (S. apus Man. ed. 7 and 111. Fl. ed. 2; 
vid. Rhodora, 17: 68, 1915.) 
Wet meadows and ill-drained hillsides; frequent in the valley, 
apparently following the limestone up the sides of the valley, reaching 
an altitude of 1300 feet in Tyringham. 
S. rupestris (L.) Spring. — Exposed rocks; occasional. Florida, 
on serpentine; West Stockbridge, on schist; New Marlboro; Shef- 
field, on limestone, altitude 700 feet; Bash Bish Falls, Mt. Washing- 
ton. 
isoEtaceae. quillwort family. 
ISOETES. Quillwort. 
I. echinospora Dur., var. Braunii (Dur.) Engelm. — (7. Braunii 
111. Fl. ed. 2.) 
