20 GEAF ZU SOLMS-LAUBACH— MONOGEAPH OF THE ACETABULAEIE.^. 



B. Rami fertiles discum umbelliformem constituentes. 



a. Sporce incrustatione calcarea in spiculam aciculiformem coadunatse, stratis 



membranaj interioribus calce destitutis 4. Acicularia. 



^. Sporse liberse per totam membranam incrustatse 3. Ch almasia. 



I. ACETABULAMA, Lam. in Bull. Soc. Phil. 1812, p. 185. 



The erect axis, clothed with successive deciduous hair-whorls, terminating when ripe 

 in a cap-like whorl, of which the rays are either free or joined together ; each such ray 

 equivalent to a cell of the hair-whorl terminating in a knoh- or cushion-shaped process, 

 closing its portion of the corona superior and hearing here branched hairs in various 

 positions ; coronal prominences forced into a lateral position by the development of the 

 originally lateral sporangium, which finally contains the round or ovate spores witii 

 membranes free from lime, and opening after a time by means of a lid and emitting the 

 gametes. These develop after germination into a plant which fruits once and dies down 

 annually to the surface of the substratum, accumulating reserve-material in a basal portion 

 which is immersed in the substratum and cut off by a partition-wall, and finally fruiting 

 after its repeated diaphysis. 



Clavis Specierum. 



A. Disci fertilis radii ad apicem usque connati^ corona superiore et inferiore 



prsediti. Coronse processus connatij superioris pilis uniseriatis 5 et ultra 



praediti. {Acetabulum.) , 1 . A. mediterranea. 



B. Disci fertilis radii plus minus connati vel subUberi^ corona superiore et 



inferiore praediti. Coronse processus inter se liberi. (Acetabuloides.) 



1. Eadiorum septa lateraha verticaliter striata. 



a. Radii apiculati, processus coronse superioris extus bilobati 2. A. Kilneri. 



^. Radii mutici, processus coronas superioris integri vel leviter emarginati. 



a. Discus diametro 15-20 mm., membrana modice incrassata 3. A. major. 



b. Discus maximus 35 mm.j membrana tenaci coriacea 4, A. Gigas. 



2. Radiorum septa Isevia, baud verticaliter striata. 

 a. Radii apiculati. 



a. Coronse superioris processus pilis ternis uniseriatis praediti. Discus 



parvus infundibuliformis, margine apiculis pyramidatis graciliter 



dentatus 5^ ^ dentata. 



b. Coronse superioris processus pilis binis uniseriatis praediti. Discus 



major margine apiculis brevibus crenulatus. 



* Disci infundibuUformes saepius plures superpositi, radiis apiculo 



^^"^^^^o 6. A.crenulata. 



** Discus planus, radiis apice emarginatis, apiculum parvum gerentibus. 7. A. caraibica. 

 /3. Radii mutici, omnino exapiculati, plus mmus emarginati. 



a. Coron-cfi superioris processus pilis quaternis irregulariter uniradiatis 



P^^diti 8. A,Suhrii. 



b. Coronae superioris processus pilis binis instructi. Radii omnino liberi. 



* Processus corouie longe discreti, subtriangulares 9. A. Calyculus. 



** Processus coronae approximati, extus subemarginati 10. A. Farlowii. 



