PELTOPHORACEAE 75 



Family 39. PELTOPHORACEAE 



ZaHLBRUCKNER 122, 176, IQO 



Thallus firm, not at all gelatinous, crustose or foliose, more or less lobed and 

 somewhat erect at the margin but never truly fruticose, typically attached to the 

 substratum by rhizoids or by a navel, with a pseudoparenchymatic cortex on one or 

 both sides or pseudoparenchymatic throughout ; apothecia typically sunken in the 

 thallus or grown together with it on the whole under side, more or less margined 

 by the thallus, but a proper exciple lacking. 



I. Thallus uniform to crustose; algae Protococcus, rarely Pleurococcus 



Subfamily Ectolechiae 122 



1. Spores transeptate, usually 2-3-celled 



a. Paraphyses not branched 



(i) Paraphyses free; no algae below the hypothecium 



Asterothyrium 123 



(2) Paraphyses united; algae below the hypothecium 



Lecaniella 124 



b. Paraphyses branched and united 



(i) Spores 2-celled Actinoplaca 124 



(2) Spores many-celled Tapellaria 243 



2. Spores muriform 



a. Asci i-spored ; hypothecium without algae 



(i) Paraphyses unbranched, free Lopadiopsis 123 



(2) Paraphyses branched, united 



(a) Epithecium without algae Sporopodium 123 



(b) Epithecium with algae *Gonothecis 123 



b. Asci 8-spored ; hypothecium with algae below 



Arthotheliopsis 124 



II. Thallus foliose or foliose scaly, rarely subfruticose; algae typically bluegreen, 



rarely bright-green 



1. Apothecia not marginal ; thallus pseudoparenchymatic throughout 



Subfamily Heppiae 176 

 One genus, parasitic on Scytonema Heppia 177 



2. Apothecia typically marginal or even with the thallus ; thallus layered 



Subfamily Peltophorae 190 

 a. Thallus foliose, usually large-leaved 



(i) Apothecia on the upper side of the thallus 



(a) Apothecia marginal on lobes of thallus ; lower surface of thallus 



without cortex 

 X. Algae Nostoc fP^ltophora 194 



fPeltigera) 

 y. Algae Palmella (Dactylococcus) *Chloropeltis 194 



(b) Apothecia superficial ; lower surface with cortex below the apothecia 

 X. Algae Nostoc Solorina 192 



y. Algae Palmella Solorinina 192 



(2) Apothecia on the under side of elongate thallus lobes; thallus com- 

 pletely corticate on both sides 



X. Algae Nostoc Nephromium 194 



