62 THE VICTORIAN NATURALIST. 



moderate, black or rufous black, crowded, plane or somewhat con- 

 cave, with thalline margin entire. Spores cylindrical, rounded at 

 each end, sometimes rounded at each end, sometimes rather curved, 

 four-celled (•o2-'o3 mm. long, •oo3--oo5 thick). Paraphyses fine, 

 inarticulate. Granula gonima moniliform, but some gathered into 

 fours in gelatinous sacs. Habitat on mosses on sub-alpine rocks. 



3. Collema senecionis. Wilson, spec. nov. 



Thallus fuscous green or olivaceous, sometimes deep sea-green 

 and bluish-green beneath, membranaceous, thin, sometimes 

 shining and sometimes granulate rugulose (2 to 3 in. 

 diam.), rotundo-lobate ; lobes ascending at margin, imbricate, 

 undulate, crispate. Apothecia rufous or testaceo-rufous, plane or 

 somewhat convex, moderate (i mm. diam.), often crowded, thalline 

 margin thin entire. Spores elongato-fusiform, straight or curved 

 or twisted, 3 to 9 septate ("03 to "05 mm. long, '005 thick). Gel. 

 hym. blue with iodine. Gran. gon. oblong or reniform (2 mm. 

 long), or sub-globose (i mm. diam.) Habitat on boughs and 

 stems of Senecio Bedfordii, very rarely on other trees, pros- 

 tanthera and pomaderis. While young the thallus is bright dark- 

 green, the centre stretched smooth, transparent, and shining, as 

 though it were a thin film of green paint. 



4. Collema atrum. Wilson, spec. nov. 



• Thallus black, small (to 1^2 inch diam.) complicato-squamose, 

 at the circumference lobate, thick, cartilaginous, granulato-corru- 

 gata. Apothecia black or obscurely rufous, or sometimes 

 whitish (diameter i mm.), thalline margin whole. Spores ovate 

 or fusiformi-ovate, acuminate at one or both ends. 3 to 4 loculate 

 (•oi8--o26 mm. long, •oo5-'oo6 mm. thick). Paraphyses 

 slender, crowded. Thecse clavate, coloured intense blue with 

 iodine. Habitat on maritime calcareous rocks. 



5. Collema leiicocarpinn. Taylor ; var. nov. mhnis, Wilson. 

 Much smaller and darker in both thallus and apothecia than 



the type. Habitat on trees by lake. 



6. Leptoghcm olivaceum. Wilson, spec. nov. 



Thallus olivaceous, paler beneath, membranaceous, rotundo- 

 lobate, undulate, smooth. Apothecia rufous or fusco-rufous, plane 

 with thin margin. Spores fusiform-ellipsoid ("013 mm. long, 

 •004 thick), 3 to 5 septate with longitudinal divisions. Habitat 

 among mosses on granitic rocks. 



7. Leptogium olivaceum ; var. zsidiosiim, Wilson. 



Thallus plumbeo-ccerulescent, tinged here and there with olive, 

 covered more or less with csesious isidia. Sterile. Habitat with 

 type. 



8. Leptogium chloromelum. Sw. ; var. nov. Viciona?m?n, Wilson. 

 Thallus like the type described by Nylander, but firmer in 



