Mr. Hassall on the Structure of the Pollen Granule. 547 



Melanthace^e. 



Pollen granule reticulated. 



Colchicum autumnale. 



Palmace^e. 

 Kunthia speciosa. 



Epigynos^e. 

 Bromeliacejs. 

 Billbergia amcena. 

 Iridace^e. 



Iris florentina. Ixia florida. Antholyza sethiopica. 



Moreea racemosa. Crocus vernus. 



Pollen granule reticulate. See fig. 16. 



Watsonia irioides. Gladiolus florabundus. 



X^emodorace^e. 

 2nd Exception. 



Pollen grain of an elongated form, expanding into a bulb at either 

 extremity, from an aperture in each of which a pollen tube issues ; it 

 may be compared to a dumb-bell, in which the cross bar connecting 

 the two globes is somewhat curved. See fig. 17, 18, 19. 



Anigozanthus coccineus. 



Amaryllidace^e. See PI. XIII. fig. 23, 24, 25, 26. 

 Obs. — An apparent exception to the usual form occurs in the pollen 

 granule of Crinum amabile, which possesses two furrows instead of 

 one. See fig. 20, 21, 22. 



Galanthus nivalis. Narcissus Jonquilla. 



Amaryllis purpurea. Zephyranthes grandiflora. 



Hsemanthus tigrinus. Alstromeria ovata. 



Griffinia hyacinthina. A. psittacina. 



Imatophyllum Aitoni. Hypoxis stellata. 

 Pancratium declinatum. 



Obs. — The closely allied orders Musacece, Marantacece, Zingibe- 

 racece or Scitaminece possess a pollen granule of the same form and 

 structure, which is thus characterized. 



Char. — Circular ; extine of considerable thickness, either smooth 

 or spinous, not provided with apertures or fissures for the escape of 

 pollen tubes, but bursting irregularly, and so exposing the intine, 

 which elongates into a pollen tube wherever thus denuded. Plate 

 XIV. fig. 30, 31, 32, 33. 



MUSACECE. 



Extine smooth. See PI. XIV. fig. 30, 31. 



Strelitzia humilis. Strelitzia Reginse. 



Marantacece. 



Extine covered with spines, having their summits perforated, 

 which disappear on the immersion of the pollen in water, leaving 



