n 



CASE ^^' UlVxWE^.. — Marine or fresh- water algae of a bright 

 146. green colour, form^^g .fl^t ribbon-lilve layers, or ari irregularly 

 distended tube, , , ,^, ,,, .. 1 'J ,' • ' . 



Note bundles of dried seaweed, as used for food in Japan, 

 furnished by Enteromorplia intestinalis, Harv., also sample of 

 E. clathrata, Ktzg., used ji^^^prth Formosa as an iugredient 

 for seasoning. .,",,/ 



CASE V' ConfervEjE. — Minute, bright green plants growing in 



147^ fresh water, sometimes appearing as a felt-like floating layer, as 



in Cladophora rivularis, Ktzg., or forming globular masses as 



in C, ^gagropila, Ktzg.. two to four inches across, called 



Moor Balls, in moorland lakes. 



VI. Conjugate. — Either one-celled plants as in the 

 DesmidiacecE, or formed of a single, unbranched row of cells, as 

 in Zygnema. Most occur in fresh water, a few flourish among 

 damp moss, or on moist ground. 



A diagram illustrating structure in ConjugatcB is shown on 

 Gallery (Room No. 9). 



Diatoms {DiatotnacecB) are all microscopic, and consist of 

 a single cell, the wall of which consists of siHca, and often 

 presents very beautiful markings under the microscope. Diatoms 

 are met with both in salt and fresh water, their siliceous cell- walls 

 often forming deposits of considerable extent and thickness. 



TABLE Mushrooms (Fungi). — The enormous number of plants 

 CAS K — *^^'^^ 40,000 kinds — belonging to the present group, differ 

 J very much in size, habit, and general appearance, but 



ail agree in tlie total absence of chlorophyll, the green 

 colouring matter so conspicuous in all other groups of plants, 

 hence all fungi are either parasites, growing on the bodies of 

 living plants or animals ; or sapropliytes, growing on decaying 

 vegetable or other organic matter. 



I. AscoMYCETES. — A large division of the fungi agreeing 

 in having the spores produced wnthin a mother-cell or ascus. 



Observe a drawing illustrating the habit and structure of 

 Exoascus deforrtians, Berk., a minute fungus parasitic on living 

 peach leaves. 



Exoasciis pruni,Y(dV\., a closely allied specie^, ^jttacks* the 

 young fruit of the sloe, also cultivated plums, and produces the 

 malformations called Pocket Plums. 



Notice in the upper part of this Case fine specimens of 

 Jr'eziza JVilkomii, Hart., parasitic on common, larqh, causing 

 the disease called Larch Cankek. ^-, ,: -jfjt 



