218 BULLETIN DE l'herbier boissier. Exormothecü. 



EXORMOTHECA Mitt. 



in Godman Hist. Azores, p. 325. 



Plantae thallosae, parvse, tenerse vel majores et robustse, virides vel fla- 

 vicanles, in una hyalinse. Frous simplex vel parum ramosa, linearis vel 

 ligulata, antice subplana, Stratum anticum vel humile stomatis alte 

 cylindricis instructiim vel altissimum (stomatis confluentibus) ; in 

 fundo strati lamelliferi adsunt ßa chlorophyllifera simplicia, maxime 

 aggregata. Costa postice valde producta. Squamae posticse magnse, dense 

 imbricalse, obtusse vel acuminataî, sub apice in facie externa appendiculo 

 filiformi vel dendroideo instructas. Inflorescentia monoica et dioica. 

 Andrœcia in medio frondis pulvinata, bene definita, haud tamen disci- 

 formia neque paleis cincla. Carpocephala pedimculata vel sessilia, e 

 fundo nudo alveoli apicalis, ssepe ante sinum dichotomise orta; pedun- 

 ciilo sulco profundo percurso, apice nudo. Receptamla globosa, ver- 

 tice haud stomatifera, Strato chlorophyllifero tecta. Archegonia plura 

 (1-5) seriata. Invohicra geminata, opposita; rede palentia cupuliformia 

 vel conchgeformia, ore plus minus lale aperta, subtus vaginatim angus- 

 tata vel aperto-decurrentia. Capsula sphserica irregulariter valvatim rum- 

 pens, pedunculo perbrevi. bulbo magno inserta; pariete unistrato, annu- 

 lalim incrassato, rufo-brunneo. Operculum cellulis majoribus dislinctum, 

 intus cellulas elateriformes pendulas maximeque incrassatas gerens. Ela- 

 teres flavescentes, laxe bi- tri-spiri. Sporœ in facie convexa vel primatice 

 areolatae et anguslatse, laeves vel minute papulosse. 



1. Exormotheca pustulosa Mitt. 1. c. 



Monoica vel dioica. Frons viridis, parva, usque ad 12 mm. longa, sim- 

 plex vel furcata, linearis, canaliculala vel subplana, crassa, marginibus 

 attenuatis; costa postice valde producta latequerotundata, sensim in alas 

 excurrens; squamae posticse marginem haud excedentes, hyalinse vel pur- 

 pureae, la te lunatse, apice duplo angusliores lateque rolundatse vel obtuse 

 breviterque bilobae, margine obtuse denticulatse, appendiculo filiformi, 

 apice geniculatim erecto. Stratum anticum humile; epidermis ob Stoma ta 

 confertissima nulla. Stomata conico cylindrica, 3 plo longiora quam lata 

 contigua, ore parvo elliptico, parvis cellulis cincto; fila chlorophyllifera 

 brevia dense aggregata, sub antris longiora et in lumen stomatorum pro- 



144 



