78017
Of his anatomical works , those of the greatest value are probably the " ( " Research on the structure and function of leaves " ) , and the " ( " New research on the epidermis " ) , in which , among other important observations , the discovery of the cuticle is recorded ; and , further , the " ( " Research on the organization of cycad stems " ) , giving the results of the first investigation of the anatomy of those plants .
 cycad
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 cycad