RIDDLE: NOTEWORTHY LICHENS FROM JAMAICA 327 
EE. Apothecia black and difform, reaching 3 mm. diam. 
2c. M. versicolor var. major 
BB. Spores curved. 
C; 
Thallus smooth or granular, but not sorediate; spores 50-65  28-35u, 
reniform, the individual cells little longer than wide (PLATE 21, FIG. 
7) 
(3. M. sulphurata) 
D. Thallus smooth or nearly so, apothecia 1.5—-3 mm. diam. 
E. Apothecia bay-brown to dark chestnut-brown, blackening 
oO OURS Rosi crecta egos 3a. M. sulphurata var. genuina 
EE. Apothecia always black... .36. M. sulphurata var. nigricans 
DD. Thallus granular-uneven, apothecia 3-6 mm. diam., blackening. 
3c. M. sulphurata var. megacarpa 
CC. Thallus verrucose, granulate, and powdery-sorediate; spores 70-125 
X 20-30 p, the individual cells about twice as long as wide (PLATE 
SY RIG Bik Deas Seer eee ee ee oee rer eet 4. M. Cummingsiae 
1. Megalospora sulphureorufa (Ny].) Riddle, comb. nov. 
Lecanora sulphureorufa (Nyl. Bull. Soc. Linn. Norm. II. 2: 69. 
1868. 
Megalospora jamaicensis Riddle, Mycologia 4: 129. 1912. 
Jamaica: Newcastle, J. A. Cushman 24; without definite 
locality, Clara E. Cummings 138, 142. 
At the time that M. jamaicensis was published, I was sure that 
there was no American species to which the specimens so named 
could be assigned. But while working at the Boissier Herbarium, 
I found an authentic specimen of the plant called Lecanora sul- 
phureorufa Nyl., based on three collections from two islands, 
New Caledonia and Lifu, situated between the Fiji Islands and 
Australia. This proved to be identical with my material from 
Jamaica. This is a remarkable distribution, and as the species is 
a conspicuous one, it seems extraordinary that it should never have 
been collected in South America, if it occurs there. 
2. MEGALOSPORA VERSICOLOR (Fée) Zahlbr.; Engler & Prantl, 
Nat. Pflanzenfam. I'*: 134. 1905. 
Lecanora versicolor Fée, Essai Cryptog. 115. Pl. 28, f.4. 1824. 
This species occurs in three varieties worthy of receiving 
names, as follows :— 
5a. MEGALOSPORA VERSICOLOR var. dichroma (Fée) Riddle, comb. 
nov. 
Lecidea dichroma Fée, Bull. Soc. Bot. Fr. 20: 319. 1873. 
According to an authentic specimen in the Boissier Herbarium! 
