Campbell.—Studies on the Araceae. 13 
convey the pollen from the older flowers to the receptive 
stigmas of the younger ones. Whether ants are the usual 
agents of pollination in this genus, I do not know. 
The endosperm, in all the species of Anthurium examined, 
very soon fills up the embryo-sac with a solid, large-celled 
tissue, very much as in Aglaonema (Figs. 53, 54). Here also, 
difficulty was experienced in making out the embryo, and it 
seems questionable whether an embryo is present in many 
cases ; but unfortunately the necessary stages could not be 
secured, and the question must remain open for the present. 
In most species of Anthurium , as in most of the Aroids ex¬ 
amined, there is a large development of mucilage about the 
ovule, and this interferes very much with the proper fixing of 
the material for histological study. Watery fixing fluids swell 
up the mucilage so strongly as to interfere with the proper 
penetration of the fixing fluid, and one must have recourse to 
alcoholic solutions. 
Philodendron. 
Material was collected in Jamaica of Philodendron lacerum, 
Schott, and P. tripartitum^ Schott, but neither proved very 
satisfactory for study, and very little was done with them. The 
ovules are small, and borne upon a slender funiculus (Fig. 56), 
which is provided with secretory papillate hairs. I was un¬ 
successful in procuring the older stages, and cannot state how 
they compare with those of other genera studied. 
Hofmeister figures the ovules of P. Imbe , but does not 
show the character of the endosperm. 
Lysichiton. 
Lysichiion Kamtschatcense , Schott, is a remarkable Aroid 
which is very common in the coast region of North Pacific 
Asia, and North America, extending as far south as Northern 
California. It is an exceedingly common and conspicuous 
plant about Puget Sound, and along the coast of Alaska, 
where I collected it in June and July, 1898. The plant grows 
