Peltigera. 179 



457, Forssell, Stud. Cephalod. (1883) p. 35, Nyl., Classif. Peltiger. (Le Natu 

 raliste 1884), Funfstuck, Beitr. Entw. Flecht. (1884) p. 2, Thallusbild. Apoth. 

 Pelt. (1884) p. 447, Hue, Addend. (1886) p. 49. 



Thallus foliaceus, saltern ambitu plus minusve adscendens, 

 solum superne strato corticali obductus, inferne nervosus et rhi- 

 zinis instructus. Stratum corticate ex hyphis (in primis) verti- 

 calibus parenchymatice septatis conglutinatis formatum, demum 

 series plures irregulariter horizontales cellularum continens, locu- 

 lis majusculis aut summis interdum demum destructis minoribus- 

 que, parietibus (membranis) sat tenuibus aut leviter incrassatis. 

 Stratum medullare stuppeum, hyphis laxe contextis, crassis aut 

 sat crassis (circ. 0,oio— 0,oo4 millim. latis), leptodermaticis, parce 

 increbreve septatis, lumine sat lato. Gonidia nostocacea (conf. 

 Bornet, Recherch. Gonid. p. 6 et 32), cellulis caeruleo-virescenti- 

 bus aut glaucescentibus, moniiiformi-concatenatis, filamentis ad in- 

 star Poly cocci glomeruloso-intricatis [in sect. Emprostea (Ach.) 

 Wainio], aut leptogonidia (dactylococcoidea, conf. Bornet, Rech. 

 Gon. Lich. p. 24), simplicia, flavescentia, parva, globosa aut ellipsoi- 

 dea, membrana tenuissima instructa [sect. Pelt idea (Ach.) Wai- 

 nio], in zona infra stratum corticale disposita, hyphis tenuioribus 

 crebre contextis immixta. Apothecia margini thalli, demum in 

 lobos accrescenti innata, demum lobis thalli antice adnata. Hy- 

 potliecium pallidum aut rufescens, ex hyphis crebre contextis pa- 

 renchymatice septatis, partim conglutinatis formatum, strato goni- 

 diis destituto medullari impostum, excipulum ceterum deficiens. 

 Sporae 8— 6:nae, fusiformes aut aciculares elongataeve, 1— pluri- 

 septatae, decolores aut dilute fuscescentes. Pycnides in margine 

 thalli sitae, fuscescentes, conceptaculo parenchymatico. Basidia 

 simplicia, fere exarticulata. Stylosporae oblongae aut ovoideo- 

 oblongae ellipsoideaeve, simplices. 



1. P. Americana Wainio (n. sp.). „P. canina var. membra- 

 nacea" Nyl. in Mandon Plant. Bol. n. 1743 (mus. Paris.). 



Thallus late expansus (long. circ. 11—5 centim.), adpressus, 

 fere dichotome aut sat irregulariter lobatus, lobis circ. 25—10 

 millim. latis, margine ambituque subintegris, superne plus minusve 

 impresso-rugosus, glaber nitidusque, sorediis et isidiis destitutus, 

 pallido-glaucescens pallidusve aut partim fuscescens, subtus ma- 

 xima parte albidus pallidusve, reticulato-nervosus, nervis elevatis, 



