Zahlbruckner : Flechten-Flora Sud-Californiens 645 



albidus, opacus, KHO leviter flavescens, CaCl 2 et KHO + CaCl, 

 in margine Hnea obscuriore non cinctus. Apothecia parva, 0.3- 

 0.7 mm. lata, rotunda vel subrotunda, copiosa, dispersa, sessilia 

 primum plana et dense caesio-pruinosa, demum parum convexa, 

 minus pruinosa vel nigricantia, margine thallino albido, integro et 

 persistente cincta. Hypothecium fusconigrum, sat crassum. Hyme- 

 nmm I vinose rubens. Asci subcylindrico-saccati vel saccati et sub- 

 cuneati, 8-spori, 47-54 fi longi et 8-9 /i lati. Paraphyses filiformes, 

 apice subclavatim incrassatae et fuscae. Sporae leviter curvulae, 

 fusiformes, apicibus obtusis, hyalinae, 3-septatae, 15-20/i longae 

 et 3—4 fx latae, episporio tenui. Receptacula pycnoconidiorum 

 minutussime, thallo immersa et solum vertice nigro nitidoque pro- 

 minentia, sterigmatibus versus basin ramosis, brevibus (13-16// 

 longis) ; pycnoconidiis minutis, oblongis, apicibus obtusis, leviter 

 curvulis, 3-4 fi longis et 0.6-0.8 p latis. 



Species thallo tenui, CaCI 2 non reagente, apotheciis parvis et ten- 

 uiter marginatis, sporis et pycnoconidiis leviter curvulis distincta. 

 A sat simili Platygrapha Calif ornica Tuck. ( = Dirina Calif ornica 

 Tuck, in litt.) jan. apotheciis rotundis et thallino-marginatis longe 

 distat. 



In cortice ramulorum Rlioidis laurinae ad ora maris prope 

 Santa Monica (no. 671). 



Opegrapha varia var. lichenoides (Pers.) f. CHLORINA (Jatta 

 Kxsicc. 53). 



Disco virescenti-pruinoso. 



Ad corticem Umbellulariae Californicae (no. 693). 



Platygrapha hypothallina sp. nov. 



Hypothallus bene evolutus, dendriticus vel connexo-ramosus, 

 albus, laxe contextus. Thallus sat tenuis, plicato-rugulosus, opacus, 

 pallide isabellinus, mollis, laxe cortextus, in hypothallo plagas for- 

 mans dispersas vel subconfluentes, KHO — , CaCl 2 erythinosus. 

 Apothecia solitaria, sessilia, subrotundata, oblonga vel gyrosa, 

 rarius substellata, convexa, albo-farinosa (detrita nigra), usque 1.5 

 |ttm. longa et 0.3-0.5 mm. lata, margine proprio nullo, sed thallo 

 in margine accessore cincta et etiam in disco lateral iter hyphis 

 thallinis, demum evanescentibus tecta. Hypothecium crassum, 

 nigrofuscum, KHO—. Hymenium 86-90 /i altum. I. vinose ru- 

 bens. Epithecium obscure fuligineum, KHO et NO,—. Par- 

 aphyses tenues, ramoso-convexae. Asci saccato- vel subcylin- 

 drico-cuneati, apice obtusi at pachydermi, 62-74 fi alti et 12-15/* 

 lati, 6-8-spori. Pycnoconidia non visa. 



