ROLL CALL 



Characteristics : Resemble algae ; plant body consists of filaments {hyphae) 

 which are not divided into cells by cross walls ; multinucleate. 



Class V — Ascomycetes — Sac fungi {Morchella, Exoascus, Microsphaera). 

 Characteristics: Includes over 20,000 species, mostly saprophytes or 

 parasites; body consists of branching mycdium throughout substratum 

 and a definite fruiting body at surface ; produce spore sacs {asci) contain- 

 ing eight spores (ascospores) ; group of asci embedded in sterile hyphae 

 may or may not be surrounded by protective envelope. 



Class VI — Basidiomycetes — Basidia fungi, smuts and rusts, wheat rust 

 (Puccinia), puff balls. 

 Characteristics: Large and varied group; specialized reproductive struc- 

 ture (basidium) is swollen terminal cell of hypha, in mushrooms the ija- 

 sidium usually bears four basidios pores, each carried on a delicate stalk 

 {sterigma) ; sexual reproduction rare; lichens — composite plants in which 

 algal cells are entangled in mycelium. Usually regarded as a parasitism 

 of algal member rather than an example of symbiosis. 



DIVISION II — BRYOPHYTA — Liverworts and Mosses. 



Characteristics : Alternation of generations in which sexual (gametophyfic) 

 stage dominates; asexual (sporophyiic) stage typically parasitic upon 

 the gametophyte ; archegonium and nmlticcUulate antheridium pre.sent ; 

 gametophyte contains x number of chromosomes while the 2 x number 

 occurs in the sporophyte; careful study of archegonium reveals typical 

 flask shape, with sterile cells (neck and venter) surrounding the egg and 

 associated cells ; antheridium more or less stalked and consisting of layer 

 of jacket cells surrounding cuboidal sperm mother cells. 



Class I — Hepaticae — Liverworts (Marchantia, Riccia). 



Characteristics: Intermediate between green algae and higher plants; 

 thaUus flattened and attached to soil by rhizoids; growth by repeated 

 division of single large apical cell. 



Class II — Musci — Mosses (Sphagnum, Polytrichum, Catherinia). 



Characteristics: In every habitat except salt water; very common in 

 alpine and arctic regions; gametophyte erect, consisting of stalk with 

 spirally arranged leaves ; attachment by rhizoids. 



