PHACIDIACEAE 



107 



(x) Algae present below the hypothecium 

 (y) Algae lacking below the hypothecium 

 y. Hypothecium black 

 (x) Thallus crustosc-fruticose 

 (y) Thallus distinctly fruticosc 

 (b) Spores dark; apothecia deeply lobed 

 X. Medulla hyaline throughout 

 y. Inner medullary layer black 

 B. Apothecia in a stroma, mostly immersed 



1. Algae Trentepohlia 



a. Paraphyses simple and free 



(1) Spores x-cclled 



(a) Spores hyaline 



(b) Spores dark 



(2) Spores muriform 



(a) Spores hyaline 



(b) Spores dark 



b. Paraphyses ramose and reticulately united 



(1) Spores x-celled 



(a) Spores hyaline 



(b) Spores dark 



(2) Spores muriform 



(a) Spores hyaline 



(b) Spores dark 



2. Algae Heterothallus; spores x-celled, hyaline 



3. Algae Phyllactidium; spores hyaline 



a. Spores 2-celled; paraphyses ramose and united 



b. Spores x-celled; paraphyses simple and free 



Pentagenella 126 

 Combea 126 



Roccellina 125 

 Roccella 125; 23 



Schizopelte 126 

 Simonyella 127 

 Subfamily Chiodectae 



Glyphis 119 

 Sarcographa 119 



Enterodictyum 120 

 Sarcographina 120 



Chiodectum 120; 23 

 Sclerophytum 121 



Minksia 121 

 Enterostigma 122 

 Rotularia 122 



Mazosia 122 

 Pycnographa 122 



Family 39. PHACIDIACEAE 



Apothecia innate, often concrete with the epiderm and splitting with it into 

 lobes or a cleft, or free and then more or less erumpent and splitting separately, 

 discoid or elongate, black, membranous to carbonous, separate or gregarious, or 

 crowded in black stroma-like areas of the leaf; hypothecium poorly developed as 

 a rule; asci mostly cylindric and 8-spored, occasionally stalked and clavate; paraph- 

 yses usually numerous, often hooked or branched at the tip, sometimes sparse but 

 very rarely absent; spores various. 



It is an open question whether the genera with elongate and cleft membranous 

 apothecia belong to the Hysteriaceae or to the Phacidiaceae; they have been placed 

 in the former by Saccardo and by Rehm, in the latter by Hoehnel. To minimize 

 the difficulty for the beginner especially, such genera have here been included in 

 both keys. There is further disagreement as to the presence of paraphyses, two 

 or three genera having been described on the basis of their absence. This may 

 be explained by those species in which the paraphyses are sparse, and the latter are 

 perhaps entirely lacking only in Dothiora, which belongs more properly in Myri- 

 angiaceae. 



Hyalosporae 



8:705, 11:431, 10:48, 14:813, 16:783, 18:155, 22:742, 24:1254 



Spores 1-celled, hyaline, ovoid to oblong 



A. Apothecia round, opening by lobes 



1. Apothecia concrete above with the epiderm Phacidium 8:709, R 66; 24 



2. Apothecia not concrete with epiderm Pseudophacidium 8:776, R 94 



