CHIODECTON ACE AE. 537 



P. caesioijruinosa differs from P. scalpturata (Ach.) Muell. Arg. in the character 

 of the spores which in the former species are four to eight in each ascus and are 

 40-85 x 14-22 in size; while in the latter species, they are constantly solitary in the 

 ascus, and 90-140 x 22-35 u in size. For a discussion of the confusion of this species 

 with P. quassiaecola (Fee) Muell. Arg. and the distinctions between the two species, 

 reference may be made to the Bulletin of the Torrey Botanical Club (44: 324. 1917). 



Family 3. CHIODECTONACEAE. 



Spores with cylindrical cells. 



Spores colorless. 1. Chiodecton. 



Spores brown. 2. Selerophyton. 

 Spores with lens-shaped cells. 



Spores colorless. 3. GlypMs. 



Spores brown. 4. Sarcographa. 



1. CHIODECTON Ach. 



Either thallus or apothecia more or less brilliant red. 



Thallus red at least in part. 1. O. sanguineum. 



Thallus not at all red, but apothecia blood-red. 2. C. cruentatum. 



Neither thallus nor apothecia at all red. 



Apothecia linear, more or less branched. 3. C. elongatum. 



Apothecia punctiform, difform, or oblong. 



Stroma distinctly convex, apothecia seriate. 4. C. quassiaccolum . 



Stroma flat or absent, apothecia scattered. 



Growing on bark ; spores 6- to 8-celled. 5. C. crassum. 



Growing on rocks ; spores 4-celled. 6. C. Bracei. 



1. Chiodecton sanguineum (Sw.) Wainio, Lieh. Bres. 2: 143. 1890. 



Byssus sanguined Sw. Prodr. 148. 1788. 



Eypochnus rubrocinctus Ehrenb. in Nees, Hor. Phys. Berol. 84. 1820. 



Chiodecton ruorocinctum Nyl. Act. Soe. Sci. Fenn. 7: 486. 1863. 



On Juniperus stumps, Andros, at Nicholl's Town : widely distributed in trop- 

 ical regions of both hemispheres. 



2. Chiodecton cruentatum Kiddle, sp. nov. 



Thallus epiphloeodes erustaceus uniformis effusus haud limitatus, albus vel 

 albidus opacus, crassiusculus verrucosus verrueis convexis hemisphericis aut 

 subglobosis, 0.3-0.5 mm. diam., conglomeratis. Gonidia chroolepoidea. Stroma 

 nulla. Apothecia dispersa, orbicularia oblonga aut pro maxima parte dif- 

 formia, 0.4-0.7 mm. lata, innata, disco piano claro cruento, margine spurie 

 thallino cincta; hymenio incolore, 60//. altit. ; hypothecio incolore. Asci clavati, 

 8-spori. Sporae incolores, fusiformes, 6-loculares, loculis cylindricis aequalibus, 

 13-16 X 4m- 



On bark of Eugenia confusa, Barnett's Point, Great Bahama (Britton and Mills- 

 paugh, February 5-13, 1905, 263.'/, type). 



The compact thallus and the absence of a stroma indicate that this species be- 

 longs to the section Enterographa. The absence of a stroma as well as the lack of 

 any trace of red coloration in the thallus serve to distinguish it from the preceding 

 species. There does not seem to be any other species with which it could possibly 

 be confused. 



3. Chiodecton elongatum Wainio, Lich. Bres. 2: 138. 1890. 



On bark, New Providence: Brazil. 



The apothecia vary from immersed in and even with the thallus to conditions in 

 which there is a definite convex stroma ; the spores may be ten-celled. 



4. Chiodecton quassiaecolum (Fee) Muell. Arg. Mem. Soc. Phys. Hist. Nat. 



Geneve 29 s : 69. 1887. 



Enterographa quassiaecola Fee, Essai Crypt. 57, pi. S3, f. 2. 1824. 



On bark of Erithalis fruticosa, Stocking Island, Great Esuma : Martinique; 

 New Caledonia ; Oceanica. 



35 



