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. complanahim 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; 

 md. 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.) 



