VI. LIST OF VASCULAR PLANTS OF THE BOTTOM AND SHORE, 
WITH VERTICAL RANGE AND THE PHYSICAL CHAR- 
ACTERISTICS OF THE HABITAT OF EACH. 
EXPLANATION OF TABLE F. 
The data included in Table F are those listed immediately below, and they 
are indicated for each species found below the 12-foot level as far as known. 
Each characteristic of the plant or its environment is indicated in the proper 
column by a word or phrase, or, for the sake of brevity, by the symbol indicated 
in this list of data. 
The 12 data noted for each species in Table F are arranged, in a horizontal 
line, in the following order: 
if Symbol: This is used to indicate the species on charts and plates. 
II. Name of the species: The nomenclature in the case of ferns and seed plants 
is that of Gray’s New Manual of Botany, seventh edition. 
III. Habitat and persistence of the species: 
1. Annual herb: an. 
2. Biennial herb: bi. 
3. Perennial herb: per. 
4. Shrub or woody vine: sb. 
5. Tree: tr. 
TV. Density of stand or frequency of individuals of the species: A dash separating 
two symbols indicates that the density varies from the first to the 
second type. 
1. Pure stand: pure. This is used only where a species may cover from 
several square decimeters to, in other cases (e. g., of larger species), 
many square meters, with dozens, scores, or hundreds of individuals. 
2. Mixed: preponderatingly, or nearly equally, with another species. This 
will be indicated by the use of the symbol for the second species 
thus: + Sp. means that the species in question has Spartina patens 
mixed with it. 
3. Seattered: among a second species and less abundantly than it; e. g., 
Sp. + indicates that the species is mingled with Spartina patens 
and is outnumbered by the latter. 
4. Grouped or clumped: gpd. 
5. Seattered, occasional, or isolated: oc. 
V. Substratum: Of the 9 substrata listed the last 4 will be used only in the list 
of alge. 
1. Mud: md. This is soft, saturated soil, usually sparsely covered. 
2. Humus: hu. Used for dry or moist humus-containing soils, except the 
peaty soil on the Marsh. It includes the very sandy humus of the 
top of the Spit. 
3. Peat: pt. This includes soils, wet or moist, chiefly of organic origin, 
and bound together by dead and living roots and rhizomes. 
4. Sand: sd. This may be dry, as at high levels on the Spit, or nearly 
saturated when between tide-marks. 
. Gravel: gv. Chiefly near high-water level. 
Rock: rk. This includes larger pebbles, the stones of the wharves, and 
boulders of the bottom or shore. 
. Shells: sh. The shells of living and dead lamelli branch and gastero- 
pods. 
. Wood: wd. Stakes, the logs of wharves, and sunken trunks or stakes 
on the bottom. 
. Living substratum: Chiefly Mytilus edulis among animals and Zostera 
and Spartina glabra among plants. Less commonly Ulva and the 
stouter red algsze may serve as substrata for certain diatoms and blue- 
green alge. Thus, e. g., ep./Z. means epiphytic on Zostera. 
151 
ie) co “a 2 Ol 
