DIPLOSCHISTES | THELOVREMACE 385 
Var. cesioplumbea A. L. Sm.—Thallus greyish leaden- 
coloured somewhat shining. Apothecia as in the species.—Urceo- 
laria actinostoma var. cesio-plumbea Nyl. in Bull. Soc. Linn. 
Norm. sér. 2, vi. p. 298 (1872) ; Cromb. in Grevillea xix. p. 60 
(1891) & Monogr. i. p. 518. 
Hesicc. Johns. n, 160. 
Hab. On rocks in maritime districts.—Distr. Sparingly in the 
Channel Islands and N.W. England.—B. M. Chateau Point, Sark ; 
St. Bees, Cumberland. 
Orper XVsa. CHRYSOTHRICACEA. 
Thallus byssoid, spongy, of branched loosely interwoven 
hyphe, not corticate. Algal cells Protococcacee or Trentepohlia, 
generally in groups lodged among the hyphe (partly homoio- 
merous). Apothecia without a thalline margin, but with a 
double proper margin; spores colourless, simple or septate. 
Spermogones (seen only in one species), with simple sterigmata 
and small spermatia. 
The Order was inadvertently omitted from the synoptical list of 
Cyclocarpinee (p. 26). It has been placed by Hue in a separate 
family ‘“ Intertexte ’’ on account of the byssoid structure. It is not 
truly homoiomerous as the alge are mostly congregated near the 
surface, a medullary stratum lying between the gonidial zone and the 
dark rhizoidal hyphe of the hypothallus. Only one genus is 
represented in our country. 
Thallus with algal cells, Protococcus ...... 61. Crocynia. 
61. CROCYNIA Massal. in Atti Ist. Venet. Sci. Lett. ed 
Art. ser. 3, v. p. 251 (1860). Leproloma Nyl. in Flora Ixvi. 
p. 107 (1883) ; Cromb. Monogr. i. p. 348. (Pl. 61.) 
Thallus of felted intricate hyphe, spreading, noncorticate. 
Algal cells Protocoecus or Trentepohlia. Apothecia sessile or 
immersed, without a thalline margin, the disc red or blackish ; 
paraphyses conglutinate, thickish, not branched ; spores 6-8 in 
the ascus, simple or 1—3-septate. 
There is only one sterile species recorded in our Islands, though a 
number of species also sterile have been found in Northern France 
and may have been overlooked here. 
1. C. lanuginosa Hue in Mém. Soe. Sci. Nat. Cherb. sér. 4, 
xxxvul. p. 229 (1909).—Thallus orbicular or effuse, adnate-lobate 
at the circumference, granular-pulverulent at the centre, white 
or yellowish-white (K —): hypothallus dark-brown, tomentose. 
Apothecia not known.—Lichen membranaceus Dicks. Pl. Crypt. 
fasc. 2, p. 21, t. 6, fig. 1 (1790)? With. Arr. ed. 3, iv. p, 612 
DL. lanuginosus Ach, Lich, Suec. Prodr. p. 120 (1798). Parmelia 
lanuginosa Ach, Meth, Lich. p. 207 (1803); Hook. FI. Scot. ii. 
I, 2c 
