462 



THE DICTIONARY OF GARDENING, 



SORUS (from aorog, 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 pinnte (see Fig. 505) 

 or fronds (see Fig. 506). Seen through a lens, these 



Fro. 60S. PINNA OP POLYPODIUM BRASILIENSE, showing drcnlar 

 Sori without Indusia. 



spots prove to be made np 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 Polypodivrn 

 (see Fig. 503), or it may be covered with a m embrace, 



Fio. 504. BACK OF FERTILE FROND OF ASPLENIUM ADIANTUM- 

 NlGRUH, 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., Aspidium, 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 fronds. 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 applied to Caryocar 

 nuciferum. 



SOULANGIA. Included under Phylica (which see). 

 SOUR GOURD. A common name for Adansonia 

 digitata. 



SOUROUBEA. A synonym of Ruyschia( which see). 



SOUR SOP, or CUSTARD APPLE. Sve Anona 

 mnricata. 



SOUTH AFRICAN YELLOW WOOD. See 

 Fodocarpns elongata. 



FIG. 505. PORTION OF FERTILE Fnovt) OF OSMITNDA REGALTS, 

 showing Sori on modified Pinnse. 



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. 



SOWERB2EA (named in honour of James Edward 

 Sowerby, 1759-1828, an eminent botanical artist). ORD. 

 Liliacece. 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., perianth segments oval-oblong ; umbel 



many-flowereA. May. I. at base of stem somewhat distichous, 



