RTS a, 
a. ' i 
\ * ~ View 
- aed 
266 Structural and Physiological Botany, == 
the conceptacles or perithecia, usually opening outwards by e 
a small orifice, the simple internal cavity of which is almost 
completely filled up by the soft hymenium (Fig. 395). 
The reproductive cells are either the result of a process. 
20 
12804 
fe 
os. 
<n On ey: : 
Sy seer gi 
PG. 394.—Truffle, Tuber melanosporum: 1. receptacle (the part that is eaten); 
II. a part of the receptacle, with spores in different stages of maturity, the 
outer cortical layer below (strongly magnified) ; III. sporangium with two spores 
(more strongly magnified). a 
of impregnation or not ; in the latter case they are called 
simple sfores, and their mother-cells sforangia ; in the 
former case different names are 
Vos Z given to them according to their 
I ZENO mode of formation. 
Reproduction by spores is by 
far the most common mode among 
Fungi. The spores, however, vary 
y 
SSS. 
Yi 
/ 
formation ; in some species two, 
(Spheriaceze): @ mature peril-  , : es . 
thecium ; 4 spore-sacs or asci. ation 1s of three principal different 
(x about 150.) lenge 
greatly in their form and mode of 2 
three, or even four forms have been ~ 
observed, forming a single cycle of 
Fic. 395. — Nectria inaurata development. ‘Their mode of form- 
