112 SIXTEENTH REPORT. 



Lycopodiaceae. Club Moss Family. 



31. Lycopodium Selago L. Rock shore crevices: Scovill Point; Passage 

 Island. 



32. Lycopodium lucidulum L. Bog forest, occasional. 



33. Lycopodium inundatum L. Bog Club Moss. Sedge zone of Bog Suc- 

 cession, Forbes Lake. 



34. Lycopodium annotinum L. Stiff Club Moss. Bog forest; Climax 

 forest. 



35. Lycopodium clavatum L. Common Club Moss. Bog forest; climax 

 forest. 



36. Lycopodium obscurum L. Ground Pine. Climax forest; bog forest. 



37. Lycopodium complanatum L. Climax forest. 



Selaginellaceae. Selaginella Family. 



38. Selaginella selaginoides (L.) Link. Moist sheltered crevices of rock 

 shores. 



39. Selaginella rupestris (L.) Spring. Rock surfaces, early stages of Rock 

 Shore Succession. 



Isoetaceae. Quillwort Family, 



40. Isoetes macrospora Dur. Quillwort. Aquatic: sheltered bays, delta 

 streams, and inland lakes; depth up to one meter. Tobin's Harbor; Amygda- 

 loid Lake; Chippewa Harbor; Hay Bay. 



Taxaceae. Yew Family. 



41. Taxus canadensis Marsh. Yew; Ground Hemlock. Climax forest, 

 very abundant; bog forest. 



Pinaceae. Pine Family. 



42. Pinus Strobus L. White Pine. Climax forest, occasional; talus slopes 

 along northwest sides of ridges. There is no indication that the White Pine 

 was ever an important constituent of the forest. 



43. Pinus Banksiana Lamb. Jack Pine. The most characteristic tree of 

 the xerophytic forest stage which sometimes intervenes between the heath 

 mat and the climax forest in the Rock Shore Succession. Dry rocky ridges. 



44. Pinus resinosa Ait. Red Pine; Norway Pine. Dry ridges, rare. 

 Successional place undetermined. Near Sumner Lake; Lane Cove. 



45. Larix laricina (DuRoi) Koch. Tamarack. Most characteristic tree of 

 the bog forest; common in the delta swamp forest; also occurs sparingly in 

 the climax forest. 



46. Picea canadensis (Mill) BSP. White Spruce. One of the three cli- 

 max trees, and the least abundant of them; frequent as a pioneer upon rock 

 shores, and occasional in the bog forest. 



47. Picea mariana (Mill) BSP. Black spruce. One of the three im- 

 portant bog trees, occurring especially in areas where sphagnum is abundant, 

 rarel}^ where it is absent; also an important constituent of the xerophytic 

 forest, the other species being Pinus Banksiana; occurs sparingly throughout 

 the climax forest, occasionally partially or wholly replacing Picea cana- 

 densis. 



48. Abies balsamea (L.) Mill. Balsam Fir. The most abundant tree of 

 the climax forest, making 75 percent of the entire stand, but only 33 percent 



