59. Q. Where are many of these one-celled plants found? A. In the green slime which grows on stones and on boards in damp places.
60. Q. What is one of the simplest forms, often found in rain-water casks, called? A. The protococcus.
61. Q. What are the unicellular plants most interesting to those who study with the microscope? A. Diatoms.
62. Q. In the living state where are diatoms found abundantly? A. In every pond, rivulet, ocean and rock-pool.
63. Q. What do they form in a fossil state? A. Large strata of rock material.
64. Q. What are thallogens? A. Plants composed of a tissue of cells, or bioplasts, but with no clear distinction of stem, root and leaves.
65. Q. What three classes are included under this type? A. Algæ, or sea-weeds; Lichens, or the dry, leafy, or mossy patches on trees, stones, etc.; and Fungi, or mushrooms, molds, and their allies.
66. Q. Into what three orders have Algæ, or sea-weeds, been divided? A. The red, the olive and the green sea-weeds.
67. Q. How are Fungi regarded by some scientists? A. As neither animal nor vegetable, but forming a sort of third kingdom.
68. Q. What seems to be the principal business of the Fungi? A. The removal of the waste material of both animal and vegetable life.