LIST OF PLANTS USED FOR STUDY. 461 



Acorus Calamus (Sweet Flag). Structure of root, 165. Roots. Fresh, or 



in alcohol. Hardy, semi-aquatic, readily grown at the edges of 



pools or slow streams. 

 Adonis (estivalis, red cell-sap in, 57. A hardy annual, flowering in June. 



autumnalis, 57. A hardy annual. Flowers in May. 



Berberidis (Cluster-cup), 330. Infected leaves of Barberry, in 



May or July. Fresh, dry, or in alcohol. See also Puccinia graminis. 

 Hippocastanum (Horse-chestnut). For mechanism of fall of 



leaves, 201. Base of leaf-stalk with piece of twig attached. Early 



autumn. Fresh, or in alcohol. 



Glandular hairs, 99. Winter buds. Preferably fresh ; or in 



alcohol. 



Pollen development, 444. 

 Agapanthus umbellatus. Development of anther and pollen, 385 ; of pollen, 



393. Greenhouse half-hardy herbaceous perennial, flowering, indoors 



or out, from April to August. 

 Agaricus campestris (Mushroom). Structure, 238. Any time in the year. 



Fresh, or preferably in alcohol. 



- Reproduction, 336. Any time in the year.- Fresh, or in alcohol. 

 A gave. Epidermis and stomata, 86. Leaves. Fresh. Any time. Green- 

 house perennials. (Substitute for Aloe). 

 Ailanthus glandulosa. For induced leaf-fall, 203. Leaf-bearing twigs. 



Fresh. 



Alder. See Alnus glutinosa. 

 Alisma Plantago (Water Plantain) 1 Structure of fruit, seed and embryo, 



413. Ripe and unripe fruits. Fresh. July and August. Native 



semi-aquatic, by water-side. 

 Allium Cepa (Onion). Structure of root, 163. Roots. Fresh, or in 



alcohol. Obtainable at any time by growing an onion in water in a 



hyacinth glass. The pollen of the onion can be used for pollen- 

 tube production, 392. 

 Alnus (Alder). Eight or ten year old twig. Fresh ; used for estimating 



length and continuity of tracheae, 161. A native tree. 

 Aloe nigricans. Epidermis and stomata, 86. Leaves. Fresh. Any time. 



Greenhouse perennial. 



(Other species, or Agave, serve equally well). 

 Alstrcemeria. Cell and nuclear division, 438. Flower-buds of various ages. 



Fresh ; also fixed and in alcohol (see p. 444). '(A. aurantiaca, the 



commonest species, is a hardy perennial, flowering July to Sept.) 

 Althwa rosea (Hollyhock). Pollen-grains, 388. Flowers. Fresh. July 



to September or October. Hardy perennial. 



1 Alisma, and most other water-side plants can be readily grown in an 

 ordinary garden in a tub or old galvanised bath partially filled with soil, 

 and kept supplied with water during the period of active life of the plants. 



