THE CRYPTOOAMIA OR FLOWERLESS PLANTS, 



625 

 524 



127 



Bepatica!. SM, Marchantia, sterilo plant. 524—5, Fortilo plant. 520, Vertical section of 

 the fertil-receptacle ; 527, of a perianth, showing the sporango bursting, 523, One of the clatora 

 with four spores. 529, Portion of it highly magnlfled. 



of the flowering plants. In the mosses, liver- 

 worts, etc., they appear only on the full-grown 

 plant ; in the ferns, Equisetacese, etc., they ap- 

 pear only on the prothallus, the earliest growth 

 of the spore, and here the archegone gives birth 

 to an embryo, whence at length the true fern 

 arises, while the prothallus dies away. 



630. Spores. These 

 are the true reproductive 

 germinating bodies of the 

 Cryptogams. They con- 

 sist each of a single cell, 

 often exceedingly minute, 

 and produced in immense 

 numbers. The cell -wall 

 of the spore may bo sim- 

 ple (Botrytis) or double, '^1^ 

 as if a cell within a cell 



(terns). iiat the spores p.„ng| 537^ Agarlcos (Mushroom) in various stases: ^ 

 are often apparently tearing open the volva; 6, annuUis, the remains of the veil 



double or 2-celled Ciioh- <''■ ''•''"^°'= "'°'^"""'"- ^''s. Pofi"" »f 'i"" sHis. 639, 



aoUDlO or ^ oeaou ^nou Basidia ami spores from the same (masn. 400 <liam.). 540, 

 ens), or 4-Cellcd, or 6, 8, Cyathus; 541, Section. 542, One of the cnnoepticles. 54.3, 

 or many-celled. rj^^^^^Penicmnm(mUiew). m,1iacov; a,v.yce\\um. 



compound spores are in fact spore-vessels inclosing several spores yet 

 immature, and called sporidi,a or theca-spores. The spores or sporidia 

 are often inclosed in still larger cells called the sac. 



631. Ekdospores and exospores. Spores are devcloned cither in 

 the interior of the parent cell or on the outside of it, and hence the di- 



