154 RippLe: THe LICHENS OF BERMUDA 
47. CLADONIA MITRULA Tuck. 
On the ground, Hall’s Island, E. G. B. 887 (typical); Paynter’s 
Vale, Brown & Britton, 980 (reduced); Paget Marsh, E. G. B. 
1862; without definite station, Brown, Britton & Seaver 1333; 
also Challenger Expedition. 
48. CLADONIA PITYREA (Flke.) Fr. 
On the ground, growing mixed with Cl. mitrula, Brown, Britton 
& Seaver, 1333 in part. 
49. CLADONIA RANGIFORMIS var. PUNGENS (Ach.) Wainio. 
Without definite station, Challenger Expedition. 
50. Psorotichia bermudana Riddle, sp. nov. 
-Thallus crustaceus effusus indeterminatus crassus (0.3-0-5 
mm.) diffracto-areolatus, areolis angulosis 1-2 mm. latis sub- 
dispersis, nitidus fusco-niger (madefactus atro-olivaceus), minute 
crebreque verruculosus vel coralloideo-granulosus; pro maxima 
parte hyphis-tenuibus laxisque constitutis, strato exteriore tenui 
parenchymatico woes 4-10 X 4-6 uw. Gonidia gloeocapsoidea 
cellulis 4-6 diam n glomerulosas circa 10-15 # consociatis, 
tegumento gelatino Paes: Apothecia a subimmersa 
demum superficialia et lecanorina, ad 0.6 mm. diam., disco 
inaequali fusco-nigro, margine thallino vie granulato; intus 
omnino incolores. Sporae incolores simplices ellipsoideae, 147 
16 X 8u. Spermagonia ovoidea verruculis thallinis immersa. 
Spermatia oblonga recta, 2-4 K Iu 
On calcareous rocks, without definite station, collected by 
Messrs. Brown, Britton & Seaver, November 29-December 14, 
1912, No. 1415. 
In habit this species resembles Psorotichia diffracta Forssell, 
as represented in Claudel & Harmand, Lich. Gall. Exsic. 301. 
51. OMPHALARIA CUBANA Tuck. 
On calcareous rocks, Castle Harbor, Stewardson Brown 628. 
52. OMPHALARIA LINGULATA Tuck. 
On calcareous rocks, Walsingham, W. G. Farlow, 1881; in the 
same region, Brown, Britton & Seaver 2245. 
Known elsewhere from Cuba and Mona Island. 
