OF INDIA AND OEYLON. 
21 ] 
Seedling at first minute, tuberous by the swelling of the hypocotyl, 
with flat green membranous cotyledons, without erect primary axis, 
the growing point immediately growing out laterally to form the thallus 
by continual branching. 
It is impossible to monograph this genus from the existing 
herbarium material ; the thallus is so closely attached to the 
rock that it cannot be removed entire, and the plants are very 
variable in their morphological features. Seven species are 
recognized by Weddell, and by Hooker, who follows him, but 
any one who has ever tried to identify a form from the 
descriptions must have suspected the genuineness of the 
species. I have transferred to Tristicha, above, the most 
aberrant form, L. ramosissima, placed under this genus by 
the authors mentioned, and by careful examination of 
living, alcohol, and herbarium material, have reduced the 
other six species to one. These six are : — 
L. zeylanica, Tul. 
pulchella, Tul. 
longipes, Tul. 
L. Lawii (Wight), Wmg. 
peduiiculosa (Wight), Wmg. 
foliosa (Wight), Wmg, 
L. zeylanica was discovered and described by Gardner in 
Ceylon. The other five are all based on Law’s material, 
collected in the Ghats, east of Bombay, as mentioned above. 
In Law’s letters, above quoted, Ave have seen that he him- 
self only collected two forms, so far as the letters show. He 
evidently sent material of these to Wight, and also to Sir 
W. J. Hooker, from whom Tulasne obtained them for his 
monograph. Both Tulasne and Wight have left type packets, 
which I have examined at Kew and Paris. All of these 
contain labels in Law’s handwriting, either “ Lawia No. 1 ” or 
“ Lawia No. 2.” No other numbers occur. Tulasne named 
these L. longipes and L. pulchella respectively ; Wight, who 
in his leones admits that he has not seen any of T ulasne’s 
specimens, names the same plants Dalzellia or Tulasnea 
pedunculosa and D. Lawii respectively. I have confirmed 
this by actual examination of the specimens, which agree 
with one another in detail. Lawia pedunculosa thus is a 
mere synonym of L. longipes, and L, Lawii of L. pulchella. 
