MICHIGAN ACADEMY OF SCIENCE. 
85 
Pinus banksiana Lamb. Jack Pine. 142. A very few old trees in the 
aspens and seedlings invading in the aspens in the area east of Pellston. 
Pinus resinosa Ait. Norway or Red Pine. 19, 20. Formerly a dominant 
tree in the pine association, now represented in the aspens by both 
old trees and seedlings, becoming more abundant. 
Larix laricina (DuRoi) Koch. Tamarack. 36. A dominant tree in the 
Lcirix association and an abundant tree in cedar bogs where it is a relic. 
Picea canadensis (Mill.) BSP. White Spruce. 76. A dominant tree in 
the Picea-Abies association, but occurs sparingly also in cedar bogs. 
Picea mariana (Mill.) BSP. Black Spruce. 45. Abundant in tamarack 
and cedar bogs. 
Picea mariana forma brevifolia (Peck) Gates comb. nov. Bog Spruce. 46. 
A xerophytic modification occuring in Chamaedaphne bogs, as at Silver 
Lake. 
Abies balsamea (L.) Mill. Balsam. 62, 104, 203. A dominant species in 
the Picea-Abies association, but occurring in hardwoods sparingly 
and in cedar bogs quite commonly. 
Tsuga canadensis (L.) Carr. Llemlock. 106, 173, 398. Frequent in 
hardwoods but not uncommon in cedar bogs. 
Thuja occidentalis L. White Cedar, Arbor Vitae. 123. The dominant 
tree in cedar bogs, a ready invader of lower associations, and to a 
moderate degree a relic in genetically higher associations. 
Juniperus communis L. Common Juniper. Found by Mr. Loew in 1910, 
and Mr. Quick in 1911. 
Typhaceae (Cat-tail Family). 
Typha latifolia L. 235. Occurring in marshy and boggy places but is 
not common. 
Sparganiaceae (Bur- reed Family). 
Sparganium simplex Huds. 519. A dominant species in the Menyanthes- 
Sagittaria association as it occurs in Bessey Creek. 
Naiadaceae (Pondweed Family). 
Potamogeton natans L. 255, 449. In Douglas and Burt Lakes. 
Potamogeton heterophyllus Schreb. Two forms of this species f .myrio- 
phyllus (Robbins) Morong and f. maximus Morong, collected in Douglas 
Lake by Miss M. Packer and Miss A. K. Dietz. 
Potamogeton lucens L. 261, 264. In Douglas and Burt Lakes in the 
Potamogeton association. 
Potamogeton richardsonii (Benn.) Rydb. 187, 258, 265?, 450, 507. In 
the Potamogeton association in Douglas and Burt Lakes. 
Potamogeton zosterifolius Schumacher. 254, 509. Potamogeton associa- 
tion. 
Potamogeton strictifolius Benn. Collected by Miss M. Packer and Miss 
A. K. Dietz, 1911. 
Potamogeton pectinatus L. 262. Potamogeton association. 
Potamogeton filiformis Pers. Collected in Douglas Lake by Miss Marga- 
retta Packer and Miss Ada K. Dietz in 1911. 
Potamogeton spp. In Potamogeton association. 
Najas fiexilis (Willd.) Rostk. & Schmidt. 263. Potamogeton association 
in Douglas Lake. 
