Knight. — On the Liclienographia of New Zealand. 377 



44. Platygrapha myriommata, Kii. 



Tliallus albido-viridi-cinerascens v. albo-ciuerascens minute areolato- 

 granulosus sub-iudeterminatus. Apothecia prominentia a tballo albo ocellato 

 pr^etexta — in initio alia abortiva, disco atro SEepe in centro albo intus car- 

 bonaceo, partim fecunda tiim plana v. convexa ferruginosa demum tenuiter 

 a thallo prsetexta ; hymenium fusco-rubicundum hypothecio nigro enatum ; 

 excipulum proprium nullum ; parapbyses breves ambigue implicate non- 

 discretas. Sporse in ascis clavatis aciculares utrinque attenuatse rectse v. 

 subcurvatffi 3-5 septatae v. simplices, longit. '04, crassit. -0025 mm. 



Ad cortices arborum. 



45. Platygrapha mecistosjMva, Kn. 



Tliallus albo-cinereus v. albo-glaucescens rimuloso-areolatus v. con- 

 tinuus. Apothecia lecedeiformia (diam. 0*7 v. minora) nigra intus fuscen- 

 tia V. rubro-fuscescentia, juniora inuato-emergentia concava dein adnata 

 plana v. convexa excipulo proprio (perithecio) atro-fusco integro marginata, 

 epithecio fusco grumoso indurato (excipulo proprio continuato), paraphysi- 

 bus discretis subtilissimis ramosis apice grumosis excipulo atro enatis. 

 Sporffl in ascis elongate -cylindraceis aciculari-cylindricse 16-35-septat8e, 

 longit. 0-13, crassit. -0035. 



Ad cortices. 



Lecidea pleistophragmia, Nyl. in litt. 



46. Verrucaria leptostegia, Kn. 



Thallus cinerascens areolato-diffractus indeterminatus. Apothecia semi- 

 immersa minuta globosa ; perithecium nudum atrum convexum v. hemi- 

 sphericum ; paraphyses graciles discretse amphithecio tenui dilute fusco 

 oriundffi. Spora in ascis cylindraceis oblongs v. fusiformi-oblongae v. 

 obovatge dilute luteol®, longit. "02, crassit. '006 mm. 



Spermagonia immersa minuta globosa ; spermatia oblonga v. linearia 

 4-septata, longit. '013, crassit. "004 mm., conceptaculo tenui oriunda. 



It is not absolutely certain that the spermagones, described above, belong 

 to V. lejjtostegia. Hitherto I have failed to find apothecia and spermagones 

 on the same thallus, except in the specimen from which the above descrip- 

 tion is drawn, and even in this instance they are not thoroughly mixed 

 together, while the thallus on which the spermagones were found is cer- 

 tainly of a somewhat lighter tint than the portion bearing apothecia, 

 although in every other respect it is uniform. This scarcely perceptible 

 difference in depth of tint is not of itself important. The spermatia, it will 

 be seen, resemble in every respect those of Verrucaria byssacea (vera), Schter. 

 (vide Leighton's figure No. 4, Plate XVI., Angiocarpous Lichens) ; but 

 differ widely from the simple spermatia found on Schferer's own specimen, 

 No. 286, Lich. Helv. Exsicc. 43 



