LICHENS AND LICHEN. PARASITES

DODGE-LICHENS AND LICHEN PARASITES 59
Thallus very fragmentary, appareiitly not stipitate, but attached by a margill as if dwarf
foliose, tea greeli; variable in thiclrness about 85r, cells in tetrads but more or less disarranged
with a thiclc medulla 15-2OP thick in the centre, hyphae slender closely woven, more or less pericli~ial
in the gel.
Z'erithecium (or apothecium) lecaiioriiie, immersed, the11 erumpent and filli~lly clropping out
lci~\lillg a hole ; amphitheei~un 35~ thick, of thick-\~~allecl hyphae more or less periclinal ai~d algal
eclls 8-9 X 5-6~; parathecinm 20-25p thiclr of highly gelifiecl strictly periclinal slelicler hyphae;
liypotliecium seemingly a deeper staining palisade extending up the sides ~iearly to the top, g;vii~g
rise to a compact, persistent thecium until the pcrithecium is mature then completely disappearing
and leaving an empty brownish cup which finally brealrs throngh to forin a hole; asci
70 X'14-17~, cylindric; ascospores ellipsoid to almost cigar shaped, 14-16 X 3-4/*, unicellular.
This specimen evidently gave Miss Cummings considerable difficulty, as she ifr rote Dr. Farlow
011 May 23 : "You may be surprised to learn that my paper on the Alaskan licheus is not published
yet. Having an opportunity to revise it I would like to ask your opinion in regard to the
enclosed specimen. Would you call it an Endocarpon or constitute a new genus for it; the
grouping of the gonidia and the way they are scattered throughout the thallns is different from
the E'ndocarpms; the fact that the apothecium is so mnch thicker than the thallns, is noticeable.
I have named it E7ulocarpon perfmatus, but it may be that a new genus should be constituted ; and
I sbould value your opinion on the subject ".
MASTODIA MEXICANA (J. G. Agardh) Dodge, n. comb.
Prasiola ntexicana. J. G. Agardh, Oefvers. K. Vetensk. Alrad. Forhandl., 4, 6; 1847. Lunds Univ.
Arsskr., 19, 85; 1882 [Til Algeriles Syst. 31.
Type : Mexico, Orizaba, Liebmann.
Kuetzing, Spec. Algar., 473; 1819, and Imhiiuser, Flora, 72, 279-281; 1889, also describe
material from the atme locality and collector under this name. The fungal component is not
satisfactorily described but it is evidently a much larger species, thallus up to 6 cm., algal cells
5-5-10 X 4.5-6/*.
GRAPHIDACEAE.
Thallus crustose, uniform, homoeomerous or heterofierous, ecorticate with Pa!mella or Trentspholia
algae. Lirellae usually elongate, sometimes shorter and broader, single or grouped, simple or
branched, immersed or semi-emersed; parathecium well developed (except in Gyntnographa)
usually carbonaceous, often with an amphithecium; disc usually long and slender; paraphyses
simple or branched and anastomosing, usually persistent; asci usually 8-spored; spermatia
,
exobasidial.
Only a single genus, Encephalographa with Palmella algae has yet been foi~nd in our region.
The family is predomi11a.ntly tropical and subtropical.
Encephdogrupha IvIass., Geneac. Lich., 13 ; 1854.
Mdanospora Mudd, &!A. Brit. Lich., 226 ; 1861. non Corda, Icones Fung., 1.24 ; 1837.
Type: based on E. Etisae Mass. and E. rubif mmis Mass., nomi~ra.
nuda first described in 1855.
Mdanospora Mudd based on Opegrapha. cerebrina DC.
Thallus epi- or endolithic, crustose, uniform, ecorticate, with Palntella algae. Lirellae almost
punctiform, at first immersed in the thallus, becoming sessile and more elongate, usually crowded