BULLETIN 
OF THE 
rOKREY BOTANICAL CLUB 
Ygjlj^'^l New York, March, 1884. [No. 3 
m 
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— ^■-^■^■^^^^^^^^ n— ^^^^^^^^M !■ — 
Two Lichens of the Pacific Coast. 
By Edward Tuckerman. 
The development of a stalk-like, descending thallus in the typical 
horizontal and crust-like one of the genus Lecidea, in Z. conglomerata, 
^cn., IS so rare that another example of it in the Italian Z. caidescens, 
Anz. acquires an importance the value of which is not affected if we 
regard it_ as only such a condition (American also) of Z. squalida, 
n f f u^-"^ Lecanora cervina, v. thanmtjia (Syn. N. Amer. lach., 
P- 202J of this Lecanora, It is indeed possible that such outgrowth 
a) prove less rare, oreven, in the proper conditions, not very uncom- 
on; and I observe it, also, in the admirably exhibited Z. Cenisia of 
;-auiornia, in specnnens from the Yosemite granite (Bolander.) 
ne Pacific coast, which furnished these lichens, has proved at once 
lertile and various in illustrations of the vertical thalhis, and I ven- 
iire to th-nk that we may add one more to them; referable this 
jeither to the typically ascendant and shrub-like, as Sicreopelte, Th. 
'"I'l ^^ {^y^'^ftothamnia, mihi (LichExNES fruticulosi) nor the typi- 
cally horizontal just above noticed, in which the members of a prop- 
erly squamous thallus, in certain conditions of the substrate, extend 
downwards into branching stems (Lichenes radio ati, si placet) but 
ere what should be a laciniate, crustaceous lichen, the appressed, 
th ^'^^^1-^^ ^i^'ctiJiiference of which is without apparent variation from 
e ordinary type in sucW lichens except indeed the sufficiently im- 
portant one that the cortical layer extends to the under side, runs, at 
IT^ T ^^^ thickened centre, with more or less distinctness, into 
,^.^^P^^^ branches (Lichenes rameo-laciniati) of which our ex- 
n ^^ ^f ^ ^be Californian Lecanora thamnoplaca, mihi (Gen. Lich. 
and^^ A ^^^ ^'^^ widely diffused Z. melanaspis, Ach. The nakedness 
r ^^^dy separableness, or even large separation of the under side 
ticTl ^^*^^^^'^^^ ^" ^''**^ ^^s^ lichen, due to the continuity of its cor- 
a layer, as well as the looseness of extreme conditions of it, have 
^ en noted by authors, but not, so far as I am aware, that its divisions 
ven'*^7^^'^^"^ n^ore than "inflated" laciniae, and really pass at last into 
r ical stems. This is the case, however, in the thickest portions of 
in ^^ V^^^-^^^^ ^s it grows in Colorado and New Mexico (Brandegee, 
ro. bprague) and, especially, in the cushion-like clumps exceed- 
6 now a quarter of an inch in thickness, in which the same acute 
in 5^^^^,^'^? found the lichen to occur nearer the Pacific, in AVash- 
se ^r , ^^^^^0'- Here the turgid, loosely intertangled divisions are 
noT \ "^ ^^ P^^^ i^to quite terete ones becoming vertical, and it is 
sent^l r^^^^^ ^^ '"^'^^^ ^'^^ plant to the species as elsewhere repre- 
tive f ^^^''f^^rnia, Bolander; and especially Kansas, Hall) irrespec- 
__^^_^Pothecial difficulties, now% and in Europe as well as here, not 
^iaeno^I »u ^^^*^*''^ ^^^er synopsis this' marked feature escaped attention in the 
fc> ^is, itiough plainly indicated in the specific name. 
