PHACELOMONAS. 



[ 590 ] 



PIIACOPSIS. 



si.sling- of sti/lospoies ; these have beeu de- 

 scribed as species of Dacnjmyces. Other 

 species also produce spermatia ; but this was 



Fig. 562. 



Fig. 563. 



Fig. 564. 



Peziza furfuracea. Small variety. 

 Magnified 5 diameters. 



long since suspected by Fries. (See PI. 27. 



%• 18.) 



BiBL. Berk. Br. Fl. ii. pt. 2. 186 ; Fries, 

 Stimma Veq. 348 ; Tulasne, Ann. Sc. Nat. 

 3 ser. XX. 167 ; Currev, Jn. Mic. Sc. v. 124. 



PHACELOM'ONAS, Ehr.— A doubtfiU 

 genus of Infusoria. 



Char. Tail-like process absent; a red 

 (eye-) spot present ; mouth teruiinal, trun- 

 cate, furnished with eight to ten anterior 

 long cilia or flagelliform filaments, vacuoles 

 numerous. 



P. pulvisculus. Body oblong, subconical, 

 attenuate posteriorly, bright green: aqua- 

 tic ; length 1-1150". Occm-s in myriads m 

 pools. Perhaps zoospores of GEdogonium. 



BiBL. Ehr. Inf. 28 ; Pritch. Inf. 494. 



PHACIDIA'CEL— A family of small 

 Ascomycetous Fungi, mostly growing in 

 large numbers on the half-decayed woody 

 parts of plants, or on the ground ; consist- 

 ing usually of davlc-coloured indurated or 

 leathery bodies, solitary or connate, or 

 seated on a common base, closed at first 

 and containing a soft nucleus; the outer 

 case (penthecmm) subsequently opening 

 widely, and presenting a cavity lined with 

 asci containing spores. 



Tlie history of development of these plants 

 is still obscure ; for many of them are con- 

 nected with certain of the Coniomycetes as 

 diHerent staa-es of one and the same plant. 

 We describe the genera according to the 

 existing classifications, noting the new facts 

 rehUing to these metamorphic phenomena 

 in the articles on the particular genera. 



British Genera. 



* Perithecium open, marf/inal, closed bij a 



lid or veil. 



Patellaria. Perithecium patelliform, mar- 



o-ined, open, covered with a thin veil con- 



fiueiit with the nucleus. Disk at length 



pulverident, the annulate asci breaking out. 



Ti/nipanis. Perithecium cup-shaped, mar- 

 gined, open, covered by a thin, evanescent 

 veil. Disk fixed in the receptacle (proper 

 stratum), at length dissolved. Asci filiform, 

 fixed. 



** Perithecium (e.rcipidum) at length open, 

 connate roitli the Jloccose receptacle. 

 Nucleus discoid, ascigerous, placed on 

 the receptacle. 



Cenangimn. Perithecium entire, leathery- 

 horny, opening by a connivent mouth, di- 

 stinct from the discigerous stratum. Asci 

 filiform, persistent, expelling the separate 

 spores -ndth violence. 



*** Perithecium entire, dehiscing hg closely 

 connivent slits. 

 Lophium. Perithecium subsessile, elon- 

 gated, compressed, bursting by a longitudinal 

 slit. Asci erect, fixed, cyhndrical, persistent ; 

 sporidia simple, rounded. Thallus crus- 

 taceous or imperceptible. 



-**** Peritliecium someiohat dimidiate, at 

 length open, nucleus naked. 



Rhgtisma. Perithecium innate, of irregular 

 form, opening by fi-agments breaking ofl' 

 into a tiexuous slit ; nucleus placeutiform, 

 persistent. Asci erect, fixed ; paraphyses 

 stalked. 



Phacidium. Peritheciumroundish, simple, 

 bursting with several teeth at the summit ; 

 nucleus disk-shaped, in some degree per- 

 sistent. Asci erect, fixed; paraphyses 

 stalked. 



Ilysteriuin. Perithecium sessile, oval or 

 elongated, with a longitudinal slit at first 

 closed, afterwards gaping open ; nucleus 

 linear, somewhat persistent. Asci erect, 

 fixed ; paraphyses stalked. 



LahreJla. Perithecium innate, bursting by 

 a longitudinal slit ; asci sliort, broad and 

 obtuse above, attenuated below, mixed with 

 short flexuose paraphyses; spores few, ovate- 

 oblong, occasionally contracted or septate in 

 the middle. 



PHACIDIUM, Fr.— A genus of Phaci- 

 diacei (Asconwcetous Fimgi), containing 

 many species growing on dead leaves, 

 branches, &c. Some of them are common, 

 as P. dentatum, on oak-leaves. 



BiBL. Berk. Br. Fl. ii, pt. 2. 291. 



PHACOP'SIS, TuL— A genus of Micro- 

 lichens, parasitic on the thallus of Evernifc 

 and Lecaiiorce. 



