Peltio-era. 179 



o 



457, Forssell, Stiid. Cephalod. (1883) p. 35, Ky]., Classif. Peltiger. (Le Natu 

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

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



TJiallus foliaceus, saltem ambitu plus minusve adscendens, 

 solum superne strato corticali obductus, inferne nervosus et rhi- 

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

 calibus parenchymatice septatis conglutinatis formatum, demum 

 series piures irregulariter horizontales cellularum continens, locu- 

 lis majuscuhs aut summis interdum demum destructis minoribus- 

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

 Stratum meduUare stuppeum, hyphis laxe contextis, crassis aut 

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

 increbreve septatis, kimine sat lato. Goniclia nostocacea (conf. 

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

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

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

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

 Gon. Lich. p. 24), simphcia, flavescentia, parva, globosa aut eflipsoi- 

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

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

 crebre contextis immixta. Apothecia margini thaUi, demum in 

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

 2)otheciiim paUidum aut rufescens, ex hyphis crebre contextis pa- 

 renchymatice septatis, partim conglutinatis formatum, strato goni- 

 diis destituto medullari impostum, excipukmi ceterum deficiens. 

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

 septatae, decolores aut dikite fuscescentes. Fycnides in margine 

 thalh sitae, fuscescentes, conceptaculo parenchymatico. Basidia 

 simphcia, fere exarticulata. Stylosporae oblongae aut ovoideo- 

 oblongae eUipsoideaeve, simphces. 



1. P. Americana Wainio (n. sp.). ,,F. 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 



miUim. latis, margine ambituque subintegris, superne plus minusve 



impresso-rugosus, glaber nitidusque, soredhs et isidhs destitutus, 



paUido-glaucescens paUidusve aut partim fuscescens, subtus ma- 



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



