4.62 
THE DICTIONARY OF GARDENING, 
SORUS (from soros, a heap). The name given to 
each of the little dark spots so commonly seen on the 
back of full-grown Fern-fronds (see Figs. 503 and 504), 
or crowded on specially modified pinne (see Fig. 505) 
or fronds (see Fig. 506). Seen through a lens, these 
] 
Fic. 503. PINNA OF POLYPODIUM BRASILIENSE, showing circular 
; Sori without Indusia. 
spots prove to be made up of a crowd or heap of small 
boxes or Sporangia (which see), each filled with Spores 
(which see). The sorus may be bare, as in Polypodium 
(see Fig. 503), or it may be covered with a membrane, 
Fie, 504. Back OF FERTILE FROND OF ASPLENIUM ADIANTUM- 
NIGRUM, showing Sori with Indusia, fixed by one edge along 
the side of the Sori. 
called the indusium. This covering in some, e.g., As- 
plenium (see Fig. 504) is fixed by one edge along the 
side of the Sorus; in others. e.g., Aspidiwm, it is fixed 
by the middle, so as to resemble a shield; in others, 
e.g., Hymenophyllum and Trichomanes, it forms a cup 
around the base of the Sorus; and there are many 
other less important variations in form. The Sori are 
situated on the veins, or at their ends along the edges 
of the ds. Differences in the arrangement of the 
Sori, and in the structure of the indusia, are much 
employed in distinguishing the numerous genera of | 
Ferns from one another. 
SOUARI NUT-TREE. A name app'ied to Caryocar | 
nuciferum. 
SOULANGIA. Included under Phylica (which see). 
SOUE GOURD. A common name for Adansonia 
digitata. 
SOUROUBEA. A synonym of Ruyschia (which see). 
SOUR SOP, or CUSTARD APPLE. See Anona 
muricata. 
SOUTH AFRICAN YELLOW WOOD. 
Podocarpus elongata. 
See 
Fig. £05. PORTION OF FERTILE FROND OF OSMUNDA REGALIS, 
showing Sori on modified Pinne. 
SOUTHERNWOOD (Artemisia Abrotanum). A very 
old inhabitant of nearly every garden. The plant is- 
grown for its medicinal properties, which are somewhat 
similar to those of Wormwood. Any ordinary garden soil- 
is suitable for its culture. Southernwood may be easily 
propagated from cuttings, which root very readily in 
early summer; also by seeds. The latter are very minute. 
SOUZA. A synonym of Sisyrinchium (which see). 
SOWBREAD. See Cyclamen. 
SOWERBZA (named in honour of James Edward 
Sowerby, 1759-1828, an eminent botanical artist). ORD. 
Iiliacee. A small genus (three species) of greenhouse, 
tufted perennials with fibrous roots, limited to Australia. 
Flowers pink, in a terminal, globular umbel; perianth 
persistent without twisting, of six oblong or ovate seg- 
ments, all free, or the inner ones shortly connate at base ; 
stamens three ; scapes or stems leafless, simple or rarely 
branched at the base. Leaves at the base of the stem 
linear-loriform. Two of the species are grown in this | 
country. They thrive in a mixture of sandy loam and ~ 
peat. Young plants are easily obtainable by divisions. 
S. juncea (Rush-like). fl., } ents oval-oblong ; umbel 
many-flowered. May. £ i girsi as obden drar i eean ; 
