Lake Distriet: Adirondack Mountains. 407 
*Maianthemum canadense Desf. MEER canadensis Michx. 
*Veratrum viride Ait. reviseta Scribn. 
Juncus trifidus L. Stipa Midocei Scribn. 
» Ailiformis L. Poa laxa Haenke. 
+Luzula parviflora Ehrh. Deschampsia flexuosa Trin. 
Scirpus caespitosus L. Hierochlo& alpina Sw. 
*Eriophorum vaginatum Am. auth. Phleum pratense L. 
(=E. callithrix Cham.). Cinna latifolia Trev. 
Carex scirpoidea Michx. » arundinacea L. 
canescens L. +Nephrodium engen spinulosumr 
>  brunnescens Poir. Des 
»  trisperma Dew. Phegopteris Bolybädieiden Fee, 
»  magellanica Lam. ke une selago 
»  sterilis Willd. + annotinum L. 
»  Bigelovii Torr. 7 » annotinum L. var. pun- 
» pauciflora Lightf. gens Desv. 
Agrostis rubra L. > » clavatum L. 
A singular lichen 7Aamnolia vermicularıs attracts attention by its pure 
white color and its cylindric, hollow, sharp pointed podetia 2—4 inches long 
growing among mosses and on the thin soil ofthe mountain tops in a sterile 
condition. It is more plentiful according to PECK on Mt. MclIntyre than on 
Mt. Tahawus. Zonsera caerulea almost ascends to the top of the mountain. 
It occurs behind the sheltering rocks but a short distance south of the signal 
station. Carex Bigelovü is the only sedge on the highest part of the mountain. 
Alpine Bog Formation. Two small marshy areas form a part of the open 
summit. One is a decided depression in the northeast slope; the other is on 
the eastern slope and is much nearer the top of the mountain. 
Here were found by me Kalmia glauca, Ledum latifolium, Vaceinium te Eriophorum 
vaginatum, Veratrum viride, Vaceinium uliginosum and several species of Car 
Bare Rock Summit Formation. The summits of lower mountains, Mt. Hop- 
kins (3,136 feet = 955 m) for example, are not above timber-line but fre- 
quently they are bare owing to rock exposures. On this mountain a smooth 
rock surface occurs in the broken areas of which Potentilla tridentata grows 
(Potentilla-Association) with Vaccinium uliginosum-Association and 
Alnus-Association. Vaccinium pennsylvanicum, Vaccinium pennsylvanicum 
var. angustifolium, Vaccinium canadense are found along the edge of the forest 
consisting at this elevation of Picea nigra, Abies balsamea, Betula papyrıfera, 
B. lenta etc. that reach quite to the top of the mountain. 
Giant Mountain (4,622 feet = 1410 m) is not bare at the summit except where shelving rocks 
occur. Here were found by me Ledum latifolium, Arenaria groenlaıdica, Marchantia polymorpha 
(in abundance), Agrostis Aa Vacceinium pennsylvanicum, Linnaea borealis, Cornus canadensis. 
> interesting Rock Gorge Formation is typically developed in the Au Sable Chasm in the 
rn part of the Adirondack Area. The Au Sable River runs through a rock gorge withalmost 
Pen sides and a few overhanging shelves. Along the crest of the preeipices and in the gorge, 
