GLYPHISJ CHIODECTONACEjE 263 



downwards ; paraphyses slender, crowded, rather indistinct ; 

 spores linear-oblong, 3-5-septate, becoming slightly brownish. — 

 Leight. in Trans. Linn. Soc. xxvii. p. 181, t. 36, f. 68 (1870) & 

 Lich. PI. p. 403 ; ed. 3, p. 436 ; Cromb. in Journ. Bot. ix. p. 179 

 (1871). 



Hah. On trees or on wood, very rare. — B. M. Killarney, Kerry. 



Seeies VI. PYRENODEI. 



Thallus foliaceous, squamulose or crustaceous, sometimes 

 developed under the bark (hypophloedal), or wanting. Algal 

 cells Cyanophycese or Chlorophycese. Fruiting body a roundish 

 perithecium immersed or superficial, usually opening above by a 

 pore (ostiole). 



The series is marked by the character of the fruits resembling that 

 of the Pyreuomycetes among fungi. The genus Strigula (see Part I. 

 p. 12) is omitted, as the only British species referred to it, Sir. Babing- 

 tonii, is a fungus. The genera classified by Cromhie {I. c), under 

 Ser. vii. Peridiodei, have also been included under Pyrenodei, with 

 the exception of the genus Endococcus, which is now recognized as 

 consisting of species of fungi parasitic on the thallus and fruits of 

 various Lichens. 



Myriangium (Family IV. Myriangiacei) (see Part I. p. 15) is also 

 now regarded as a genus of Fungi. 



Tribe XX. P Y R EN C AR P E I. 



Thallus foliaceous, squamulose or variously crustaceous, some- 

 times obsolete. Perithecia immersed in the thallus or more or 

 less superficial, scattered or united in a stroma, the outer wall 

 soft and waxy or carbonaceous ; contents soft and mucilaginous, 

 often interspersed with oil-drops, sometimes enclosing hyraenial 

 gonidia ; paraphyses simple or branched, sometimes disappearing 

 or altogether wanting. 



With the exception of the Order Pyrenidiacese (Tribe iii. Pyrenidiei, 

 Part I. pp. 3, 81), the lichens of this tribe contain gonidia belonging 

 to the group of green AlgEe, Chlorophycese. The Order Astrotheliacese 

 is not represented in the British Isles. Astrothelium pa/rmularia 

 Leight. Lich. Fl. p. 467 ; ed. 3, p. 499 {Sphcjeria pa/i-mularia Berk, in 

 Hook. Journ. Bot. iii. p. 19 (1851)) is a fungus. 



The following Natural Orders are British ; — 



PYRENIDIACEiB. — Thallus squamulose or crustaceous, 

 sometimes corticated. Algal cells {gonimia) Cyanophycese. 

 Perithecia simple with an apical ostiole. 



DERMATOCARPAOE^.— Thallus foliaceous, squamulose 

 or crustaceous, often corticated on one or both surfaces. Alga] 

 cells {gonidia) Palmella. Perithecia simple with an apical ostiole. 



