Sentence:  The spores, so soon as they are ripe, either drop out of the sporiferous membrane ("hymenium"), or, as more frequently happens, are projected from it with an elastic jerk, or else, as is the case of Agarics of a <WSD>deliquescent</WSD> kind, return to the earth mixed up with the black liquid into which these ultimately resolve themselves. 
Meaning of the word marked with <WSD> tags:  Becoming liquid as a phase of its life cycle.