178 Transactions British Mycological Society. 
previous descriptions in his “941. Lichen leprosus albicans, 
lineolis nigris characteriformibus,” and quoted Ray, Dillenius’ 
No. 1, and Micheli’s No. 9, and included Micheli’s Nos. 10 
and 11 (following Dillenius) as varieties. In Species plantarum 
(v1, p. 1140) Linnaeus gave this the binomial Lichen scriptus, and 
the name Lichen rugosus to Dillenius’ No. 2, with the descrip- 
tion ‘‘Lichen leprosus albicans lineolis simplicibus punctisque 
nigris confertis.”’ 
References to these species of Linnaeus were given in a 
number of the Floras that were so commonly published by 
various workers who followed Linnaeus, but in most of these no 
new data that enlighten us regarding the Hysteriales are found. 
Lightfoot (7, pp. 800, 80r) in 1777 gave the following suggestive 
notes:—‘‘[Lichen] scriptus. 1. Lichen leprosus albicans, lineolis 
nigris ramosis characteriformibus. Sp. pl. 1906. Micheli gen. 
t. 564. 3/ Willem: muse: t.126. 4, ©. 
“On the smooth bark of trees, frequent, as on beech, oak, 
hornbeam, etc. This is readily distinguished by its black fructi- 
fications, resembling small oriental characters, which, under the 
microscope, appear to be longitudinally wrinkled. 
“There are two very remarkable varieties of this lichen, 
which might perhaps be more properly considered as distinct 
species: 
“Hebraicus a. The first has large black, smooth fructifications, 
standing in high relief, of no regular figure, but from their size 
and thickness have a rude likeness to Hebrew characters. Fig. 
non inveno. 
‘“Pulicaris 8. The other consists only of small black, oval 
tubercles each about the size of a flea, having a longitudinal 
furrow on the back. It grows generally in the crevices of the — 
bark of old oaks. The figure of Micheli agrees with it. Gen. pl. 
t; 54. ordo 37.1. 2: 
“Neither of these two last are in Dillenius’s collection at 
Oxford.”” The specimens upon which Lightfoot based the above 
descriptions could not be found in the Lightfoot herbarium 
at Kew. 
Wiggers (8, p. 86) transferred Lichen scriptus, L. rugosus, and 
others to his genus Verrucaria. Hoffman (9, p. 14) made Light- 
foot’s varieties into species. His figures (t. 3. fig. 2, e, f) are 
uncertain. 
Bulliard (ro, p. 187) figured and described rather indefinitely — 
Variolaria corrugata on the bark of branches, and (p. 170) Hypo- 
xylon ostraceum, both of which may have been Hysteriales. 
Tode (rr) in 1783 described Acrospermum unguinosum but the 
genus is usually stated to date from his 1790 work. In 1784 (za) 
he applied the name Hysterium to a fungus which he described 
