PHACELOMONAS. 



[ 590 ] 



PHACOPSIS. 



sisting of stylospores ; these have been de- 

 scribed as species of Dacrymyces. 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, 

 Summa Veg. 348 ; Tulasne, Ann. Sc. Nat. 

 3 sr. xx. 167 ; Currey, Jn. Mic. Sc. v. 124. 



PHACELOM'ONAS, Ehr. A doubtful 

 genus of Infusoria. 



Char. Tail-like process absent; a red 

 (eye-) spot present ; mouth terminal, 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 j length 1-1150". Occurs in myriads in 

 pools. Perhaps zoospores of (EDOGONIUM. 



BIBL. Ehr. Inf. 28 ; Pritch. Inf. 494. 



PHACIDIA'OEI. 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 dark-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 (perithecium) subsequently opening 

 widely, and presenting a cavity lined with 

 asci containing spores. 



The history of development of these plants 

 is still obscure ; for many of them are con- 

 nected with certain of the Coniomycetes as 

 different stages of one and the same plant. 

 We describe the genera according to the 

 existing classifications, noting the new facts 

 relating to these metamorphic phenomena 

 in the articles on the particular genera. 



British Genera. 



* Perithecium open, marginal, closed by a 

 lid or veil. 



Patellariq. Perithecium patelliform, mar- 

 gined, open, covered with a thin veil con- 

 fluent with the nucleus. Disk at length 

 pulverulent, the annulate asci breaking out. 



Tympanis. Perithecium cue-shaped, mar- 

 gined, open, covered by a thin, evanescent 

 j veil. Disk fixed in the receptacle (proper 

 stratum}, at length dissolved. Asci filiform, 

 fixed. 



| ** Perithecium (exciprulum) at length open, 

 connate with the Jloccose receptacle. 

 Nucleus discoid, ascigerous, placed on 

 the receptacle. 



Cenangium. Perithecium entire, leathery- 

 horny, opening by a connivent mouth, di- 

 stinct from the discigerous stratum. Asci 

 filiform, persistent, expelling the separate 

 spores with violence. 



*** Perithecium entire, dehiscing by closely 



connivent slits. 



Lophium. Perithecium subsessile, elon- 

 gated, compressed, bursting by a longitudinal 

 slit. Asci erect, fixed, cylindrical, persistent ; 

 sporidia simple, rounded. Thallus crus- 

 taceous or imperceptible. 



**** Perithecium someivhat dimidiate, at 

 length open, nucleus naked. 



Rhytisma. Peritheciu m innate, of irregular 

 form, opening by fragments breaking off 

 into a tiexuous slit ; nucleus placentiform, 

 persistent. Asci erect, fixed; paraphyses 

 stalked. 



Phacidium. Perithecium roundish, simple, 

 bursting with several teeth at the summit ; 

 nucleus disk-shaped, in some degree per- 

 sistent. Asci erect, fixod; paraphyses 

 stalked. 



Hysterium. Perithecium sessile, oval or 

 elongated, with a longitudinal slit at first 

 closed, afterwards gauing open ; nucleus 

 linear, somewhat persistent. Asci erect, 

 fixed; paraphyses stalked. 



Labrella. Perithecium innate, bursting by 



a longitudinal slit; asci short, broad and 



i obtuse above, attenuated below, mixed with 



short flexuose paraphyses; spores few, ovate- 



1 oblong, occasionally contracted or septate in 



the middle. 



PHACID'IUM, Fr. A genus of Phaci- 

 diacei (Ascomycetous Fungi), 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. 

 t PHACOP'SIS, TuL A genus of Micro- 

 lichens, parasitic on the thallus of Evernicc 

 and Lecanorce. 



