length, under a high magnifier, appears, when moist, of a subolivaceous black, resembling a minute Sphæria (M. J. Berkeley). Mouth 200 to 400μ broad; the disc when moistened is pale yellowish brown. Name-ukpós, small, σróua, the mouth; from the small mouth. 4. Stictis pteridina. Phil. and Buck. Scattered, slightly immersed, circular or elongated, irregular, open; hymenium pallid-brown, not deeply depressed; margin membranaceous; asci broadly clavate; sporidia 8, biseriate, clavate or clavate-fusiform, 6 to 7 times pseudo-septate or muriform, 28-44 × 5—9μ; paraphyses filiform, adherent. Stictis pteridina-Phil. and Buck. in Bucknall's "Fung. Bristol," pt. vi. p. 5, t. 1, f. 6. On stems of Pteris aquilina. Name Pteris, the genus of ferns on one of which it grows. Near Bristol! (Mr. Cedric Bucknall). C. SPORIDIA FUSIFORM. 5. Stictis hysterioides. Desm. Immersed, closed, hysteriform, then erumpent, prominent, open, ovate-oblong or suborbicular; border brown-black, subgranulate; hymenium waxy, tawny or rufus; asci cylindraceo-clavate; sporidia 8, oblong, obtuse or fusiform, with 4 gutta, 16 x 3-4u; paraphyses filiform. Stictis hysterioides-Desm., "Ann. Sc. Nat.," 1843, p. 365; B. and Br., " Ann. Nat. Hist.," No. 314; Cooke, "Handbk.," No. 2225. Propolis hysterioides-Fckl., "Symb. Myco.,” p. 255. Exs.-Berk., No. 308; Moug. and Nest., No. 1242; Roumg., "Stirpes," 337. On dead leaves of Carices. Name Hysterium, a genus of fungi, sidoç, likeness; like a Hysterium. Thame (Dr. Ayres). Rudloe, Wiltshire (Mr. C. E. Broome). 6. Stictis seriata. Lib. Innate, punctiform, orbicular, plane or but slightly concave, disposed in approximate series, rubro-fuscous; asci linear-fusiform or subclavate; sporidia minute, oblong or fusiform (?); paraphyses filiform, slender, adherent. Stictis seriata-Lib., “Crypt. Ard.," fasc. iii. No. 233; Phil. and Plow., "Grevillea," iv. p. 233. 233. Nævia seriata -Fckl., "Symb. Myco.," p. 249. Exs.-Lib., l. c.; Fckl., “F. Rh.," 1841; Phil., “Elv. Brit.," No. 100; Rabh., “Fung. Eur.," 1710 and 1909. On Carex ampullacea. Receptacles about 150 to 200μ, covering the leaves on the under side. This species is easily recognized, but after repeated searches I am not able to detect the sporidia. Fuckel says, " sporidia 6 to 8, globosa, minuta, hyalina includentibus." The asci are about 250 × 6μ. I am not sure that it should remain amongst the Stictei; it is very near Phacidium. Name Series, a row; from growing in a row. 7. Stictis Fagicola (nov. sp.). Gregarious or scattered, immersed, urceolate, yellow ; mouth connivent, nearly round or somewhat elliptic, surrounded by a spurious border of the same colour; asci cylindrical, slender; sporidia 8, fusiform, straight, simple, 8 × 2u; paraphyses filiform, globose at the apices. On beech-fallen, dead, decorticated branches. About to a line broad. Exactly resembling externally the next species, but having different asci, sporidia, and paraphyses. Name-Fagus, the beech, colo, to inhabit. 8. Stictis punctiformis. Pers. Gregarious, minute, immersed, urceolate, suborbicular; hymenium reddish-brown or fuliginous; mouth connivent, surrounded by a border of the same colour; asci cylindraceo-clavate; sporidia 8, fusiform, simple; paraphyses filiform, globose at the apices. Stictis punctiformis Pers. in Gay's collection in Kew Herbarium, named by Persoon himself, with which the English specimen has been compared. On dead willow-wood. Cups 100 to 500μ broad. Very similar to S. Fagicola, but the sporidia are simple, and the paraphyses are globose at the apices. Name Punctum, a point, forma, shape. D. SPORIDIA DOUBTFUL. 9. Stictis graminum. Desm. Orbicular, scattered, small, deeply excavated; disc black; margin prominent, clad with a white meal, nearly entire; asci elongated; sporidia (very minute, globose). Stictis graminum-Desm., "Crypt. Fr.," exs. No. 1071; "Ann. Sc. Nat." (1840), xiii. 185; B. and Br., "Ann. Nat. Hist.," 1328; Fckl., "Sys. Myco.," p. 250; "Grevillea," i. p. 132; Gill., "Champ.," p. 179; Pat,, p. 30, f. 69 (?). Exs.-Desm., "Crypt. Fr.," 1071; Fckl., “F. Rh.,” 1106. On Carex paniculata. June. Desmazieres describes the sporidia as very minute, globose;" Fuckel as "filiform, as long as the ascus. Not having seen the British plant, we cannot determine the form of sporidia (Cooke, l. c.). Rejected Species. Stictis parallela, Fries, is a Xylographa (vide Leighton's "Lichen Flora of Great Britain "). Stictis longa, Fries, is a Xylographa. Order VIII.-PHACIDIACEÆ. Receptacle immersed, more or less coriaceous; hymenium at first covered, at length exposed by the regular or irregular fissure of the outer covering. (Plate XII. figs. 76-78.) Name From the typical genus Phacidium, ARRANGEMENT OF THE GENERA. Hymenium becoming exposed by the epidermis of the matrix splitting from the centre into lacinia Phacidium. Hymenium becoming exposed by splitting at the summit irregularly.. Hymenium becoming exposed by the falling off of a horizontal operculum GENUS I.-PHACIDIUM, Fries. Trochila. Stegia. Perithecium orbicular, flattened, subdimidiate, dehiscing from the centre into laciniæ, distinct from the placentiform disc. (Plate XII. fig. 76.) The perithecium is covered by the epidermis of the matrix; the hymenium is mostly dark-coloured, lining the base of the perithecium. On leaves and bark. Name-pakós, a lentil, îdos, resemblance; shaped like a lentil. (Hymenium dirty-yellow: on Quercus Hymenium whitish: on Rubus Hymenium whitish on Ilex 3. Hymenium whitish: on Quercus striatum. leptideum. Hymenium pallid, livid, or yellowish: on Quercus coronatum. Hymenium sooty-black: on Vaccinium Hymenium pale brown : on Arctostaphylos.. Hymenium cinereous: on Pinus Rubi. Ilicis. minutissimum. Vaccinii. Arctostaphyli. abietinum. 1. Phacidium tetrasporum. Phil. and Keith. Epiphyllous, erumpent, circular or oblong, convex, cinereous, seated on a brownish-yellow spot, splitting irregularly into 3 or 4 laciniæ; hymenium black on the surface, brownish-yellow within; asci broadly clavate; sporidia 4, elliptic-ovate, with a septum near the lower end, often with a papilla, brown, 25-28 x 17μ; paraphyses numerous, filiform, with brown, pear-shaped heads, septate. Phacidium tetrasporum-Phil. and Keith. in Gard. Chron., 1880, Sept. 4, t. 56; "Scott. Nat.," vi. 164. On the upper side of juniper-leaves while yet green, simulating a Puccinea. About a line broad. τετράς, σπόρος, Name TETρáç, four, oπópоç, seed; four-seeded. Erumpent, black; receptacles minute, rounded or oblong, globose, then flattened, solitary and scattered, or |