vill 
Isidia—Coral-like papillee with dark apices. 
Medulla—The usually colourless internal tissue. 
Mowiform—W ith transverse and irregular longitudinal divisions. 
Nuclear—Roundish, with an apical pore. 
Ostiole—An apical pore. 
Paraphyses—Slender filaments among the thece. 
Peridioid—Roundish, without a pore. 
Peridium—The hypothecium of a peridioid apothecium. 
Podetium—An erect cylindrical thallus terminated by the fruit. 
Polari-bilocular—With a loculus at each end. 
Pyenides—Conceptacles bearing stylospores. 
Pyrenium—The hypothecium of a nuclear apothecium. 
Seyphus—A dilated cup-shaped fruit borne on a podetinm. 
Soredia Powdery masses of gonidia and hyphe. 
Stylospores—Asexual spores. 
Thalamium—The paraphyses. 
Thece—The spore-sacs. 
Thectum=Hymenium. 
CHEMICAL REACTIONS. 
The solutions employed are:—(1) Hydrate of potash, denoted by the 
symbol K, and composed of equal weights of caustic potash and water ; 
(2) Hypochlorite of lime, denoted by CaCl, and composed of chloride of 
lime and about half its weight of water; (3) Iodine, denoted by I, and 
composed of iodine 1 grain, iodide of potash 3 grains, and. distilled water 
3 oz. For the sake of brevity, symbols are employed to express the 
reactions. The explanation of a few examples will be found sutticient to 
explain the rest. Thus CaCl+crimson indicates the cmmediate pro- 
duction of a crimson coloration upon the application of the solution 
CaCl. CaCl— means that no reaction occurs with this reagent. 
Kf+tyellow means a faint yellow reaction with solution K. The 
reaction of the cortex is placed above that of the medulla; thus 
ies means that the reaction of the cortex is yellowish and 
that of the medulla orange. K(CaCl)+vislet means that K alone 
gives uo reaction, but when it is followed by the application of CaCl 
a violet colour is produced. On the other hand, the reaction given by 
may be neutralized by the addition of CaCl, in which case it is expressed 
by K+(CaCl)—. A more or less fuscescent colour produced by K 
or CaCl is disregarded, as not being a true reaction, and has the negative 
s1en. 
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