LINDSAY, ON POLYMORPHISM IN LICHENS. 



apices only of the Basidia, 

 one from each Basidium. 



or sides of Sterigmata ; in the 

 case of compound Sterigmata, 

 many from each "Arthro- 

 sterigma." 



7. Origin. — Given off from 

 the cells constituting the ste- 

 rigmata, by a process called 



by Nylander " Spiculation," " Progemmation," whereby 

 whereby the cell- wall be- new terminal or apicial cells 



7. Origin. — Given off from 

 the Basidium-cell or tube, by 

 a process called by Nylander 



are developed from or upon 

 other older or basal ones. 



comes protruded into a spi- 

 cule, which is ultimately de- 

 tached by gradual constriction 

 of its base. 



If it can be proved that spermatia are solid, and stylospores 

 hollow bodies, it may be admitted that the process of separa- 

 tion in the two cases essentially differs. But in all other re- 

 spects the processes in question appear identical or similar. 



8. Function. — Absence of 8. Function. — Nylander as- 

 all germinative faculty, so far signs the power of germina- 

 as known. tion. Berkeley always speaks 



of stylospores in Fungi as 

 "naked spores" — as second- 

 ary spores capable of germi- 

 nation; and he distinguishes 

 in some Sphserise, Pycnidia 

 from Spermogonia, by observ- 

 ing whether the terminal cel- 

 lules are or are not capable of 

 germination. The fact and 

 function of germination may 

 exist ; but in Lichens it still 

 requires proof. I have not 

 observed it myself, nor am I 

 aware of any record of such 

 an observation by others. 



9. Associated substances. — 

 Oil-globules frequently and 

 copiously intermixed. 



9. Associated substances. — 

 Oil-globules never inter- 

 mixed. 



II. Sterigmata. 



1. Form. — Simple or com- 

 pound : latter — known as 

 " Artbrosterigmata" — consist 

 of a few or many superim- 

 posed cellules of varying 



II. Basidia. 



1. Form. — Always simple 

 or unicellular ; usually linear 

 and cylindrical; each bear- 

 ing at its apex a single stylo- 

 spore; comparatively uniform. 



