_CHRISTENSEN.—Behaviour of N.Z. Arboreal Plants buried by Shingle. 547 
SPHAGNUM-MOSS PLANTS. 
The = inhabiting the sphagnum-moss bogs have to grow faster 
than the moss or else be smothered : a slow-growing plant would very 
E = оона and killed. 
thofagus cliffortioides (Hook. f.) Oerst. can withstand a fair amount 
of jurat some of the trees that were examined being covered to the tips 
of the lower branches and still looking quite healthy. 
Several plants of Senecio Bidwilli? Hook. f. under observation' were 
unable to grow as rapidly as the sphagnum moss, and in course of time 
were completely buried and killed. 
Leptospermum scoparium, Dracophyllum uniflora, сетте. toumatou, 
Olearia cymbifolia, Gaultheria rupestris, Veronica buxifolia, Vero co 
phylla, V. salicornioides, and numerous other shrubs and plante. inhabiting 
the moss-bog manage to live and thrive through possessing the power of 
either putting forth adventitious roots or of being able to grow rapidly 
enough to keep well above the surface of the mo 
SHINGLE-BURIED PLANTS. 
The shingle being moist and well aerated enables certain of the buried 
plants to put е ар раар lateral roots, while others not possessing 
this property eventuall 
Numerous ийан 57 show that е moisture reaches to within 
between the surfac e-temperature and that of 6in. below. For instance, 
on the 14th March, 1920, at 3 p.m. the thermometer registered 95° Е. on 
elow 
happened. 
In very few instances have Nothofagus cliffortioides managed to survive 
the burial. Plate 51, fig. 1, shows one healthy specimen “that still thrives 
in spite of having its trunk and lower branches deeply buried. Plate 51, 
. 2, shows one that did not survive. One dead tree had stones lodged 
in its branches some 8 ft. above the present level of the abn gle. 
8 um scoparium and L. , where growing in the path 
of rapidly-moving shingle, are occasionally so badly injured that they 
die. (See Plate 52, fig. 3.) The action of the shingle is sometimes so 
severe that all the bark is worn off "the trunk. 
The following are a few examples of adventitious rooting :— 
Rubus australis Forst. £—The vine of this plant had only recently been 
inspection of this plant eighteen months afterwards showed the uncovered 
roots to be withered, and to have practically disappea 
Linn. f.—The branches ad E tree had € Е 
ength. 
Fuschia сн. 
dicus = had put forth numerous roots from 1 ft. to З ft. 
nia littoralis Raoul.—This tree was контр at the ds of some 
Shingle. Owing to a 
trunk exposed. At a height of 4ft. 6in. above the present ground- -level 
18* 
