Our Lexicon Page 



359 



Gastero-mycetes, lit., stomach-fungi. Fungi in which the 

 spore-bed or hymenium is, until ripe, concealed in a protec- 

 tive skin or coat. 



Haustorium, lit., a sucker. When applied to fungi it desig- 

 nates a short tube branching out from a spore or hypha and 

 penetrating the tissues of the host. 



Campanulate. formed like a bell, might, for English 

 readers, be suitably substituted by Bell-shaped. 



Neolithic, new stone age. The prefix Neo means new or 

 modern. If the word to which it is affixed begins with "o" 

 then one " o " is omitted. 



Myomorphic, lit., mouse-like. Allied to mice. 



Bast. The inner bark of exogenous trees, the " liber." 



Liber, lit., free. The inner part of the bark of exogenous 

 trees. It is so-called because free, that is, not united to the 

 stem inside it. 



Alveolus, lit., a little trough. That part of the jaw bones 

 in which the teeth are lodged. The alveolus grows with the 

 development of the teeth and shrinks when they are lost. 



Myco-rhiza, lit., fungus-root. The growth of fungi on 

 the smaller roots of plants and trees, which are useful in pre- 

 paring material for root-absorption. 



Hypha, a single thread, or filament, of a fungus growing 

 at its point. When numerous hyphas are interlaced they 

 form a mycelium or web. A hypha may bud out at its sides as 

 well as grow at its point. It consists of a thin cellular mem- 

 brane enclosing protoplasm, and differs from a spore, or 

 cell, chiefly in its great elongation. Divisions or septa are 

 often present. 



Thallus. A web formed of interlacing hyphae. 



Sorus. A mass of spores arranged in a heap or cluster. 



Hymenium, " spore mother-cells, aggregated in a continous 

 layer upon a sporophore, or that specialised portion termed 

 the receptacle." — Cooke. 



(To be continued.) 



