1904] BRIEFER ARTICLES 219 
were of two kinds, the entire thallus, and individual lobes (fig. 1). To 
obtain the best results they should all be of the latter kind, as owing to the 
constant breaking off of long plants it is impossible to be sure of results, 
or even to find the plants measured. About twenty-five measurements 
were thus lost because the mistake was made of measuring the whole plant, 
which later was broken up by the winter rains and winds. 
Number September May Growth Per cent. of growth 
hee eee rea 3.0cm 4.r¢m I.rem 36.66+ 
el oe eee 34.0 38.0 4.0 rr. 76+ 
ee 6.0 5 ro5 25.00 
CBee sees 6.0 8.8 2.8 46.66+ 
es Piece sss 28.0 32-5 4-5 16.07 + 
Deb ec erase 16.0 25.0 9.0 56.25 
ee eeianeatessd 8.0 10.0 2\.6 25.00 
| Se 46.0 54-0 8.0 17.00+ 
CSP Sra RSE En 47.0 0.0 43-0 1.00+ 
oe ae ee Rae ae 5.0 - 3 Ae ae 
ee cates « 8.0 The3 203 4.25 
(Sold seta lp 2.5 5% 16 51.42+ 
Dismissing no. 6418 B, which may be due to the tearing of the long 
thallus by the winds, we see that the short lobes, 3 to 16°™ in length, 
show a rate of growth astonishing for lichens; but one to be expected where 
they grow under such favorable conditions. Taking those fronds of 16 “™ 
or less in length, we find an average growth in length of 41 per cent. No 
measurements were made to ascertain the increase in width of the lobes. 
It was intended to make an extended series of measurements on various 
lichens, but it was not possible to do so. However, measurements were 
made of a specimen of Parmelia caperata (L.) Ach. growing on the trunk 
of Aesculus calijornicus. : 
ota sepeeniner 25 May 5 Growth 
Longitudinal diam 
CR restate ss, : a 
Transverse diameter..." ni = eS S ; : 
dias, growth of this plant is really much greater than appears, as it is 
ns over the entire margin of the circular thallus, and hence is difficult 
i iM percentages. 
Piri: hoped that students in favorable localities may be induced by the 
on shag to undertake a series of measurements and observations on 
: y the very large foliaceous lichens, but also on the crustaceous 
ea apes of which no doubt grow very rapidly.—ALBERT C. HERRE, 
jord University, California. 
. 
